| /******************************************************************************* |
| * Copyright (c) 2000, 2003 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.swt.graphics; |
| |
| import org.eclipse.swt.internal.*; |
| import org.eclipse.swt.internal.gtk.*; |
| import org.eclipse.swt.*; |
| |
| /** |
| * <code>TextLayout</code> is a graphic object that represents |
| * styled text. |
| *<p> |
| * Instances of this class provide support for drawing, cursor |
| * navigation, hit testing, text wrapping, alignment, tab expansion |
| * line breaking, etc. These are aspects required for rendering internationalized text. |
| * </p> |
| * |
| * <p> |
| * Application code must explicitly invoke the <code>TextLayout#dispose()</code> |
| * method to release the operating system resources managed by each instance |
| * when those instances are no longer required. |
| * </p> |
| * |
| * @since 3.0 |
| */ |
| public final class TextLayout { |
| |
| static class StyleItem { |
| TextStyle style; |
| int start; |
| } |
| |
| Device device; |
| Font font; |
| String text; |
| int ascent, descent; |
| int[] segments; |
| StyleItem[] styles; |
| int /*long*/ layout, context, attrList; |
| |
| static final char LTR_MARK = '\u200E', RTL_MARK = '\u200F', OBJECT_REPLACEMENT_CHARACTER = '\uFFFC'; |
| |
| /** |
| * Constructs a new instance of this class on the given device. |
| * <p> |
| * You must dispose the text layout when it is no longer required. |
| * </p> |
| * |
| * @param device the device on which to allocate the text layout |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li> |
| * </ul> |
| * |
| * @see #dispose() |
| */ |
| public TextLayout (Device device) { |
| if (device == null) device = Device.getDevice(); |
| if (device == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| this.device = device; |
| context = OS.gdk_pango_context_get(); |
| if (context == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| layout = OS.pango_layout_new(context); |
| if (layout == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| OS.pango_layout_set_wrap(layout, OS.PANGO_WRAP_WORD_CHAR); |
| OS.pango_layout_set_tabs(layout, device.emptyTab); |
| OS.gdk_pango_context_set_colormap(context, OS.gdk_colormap_get_system()); |
| text = ""; |
| ascent = descent = -1; |
| styles = new StyleItem[2]; |
| styles[0] = new StyleItem(); |
| styles[1] = new StyleItem(); |
| if (device.tracking) device.new_Object(this); |
| } |
| |
| void checkLayout() { |
| if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); |
| } |
| |
| void computeRuns () { |
| if (attrList != 0) return; |
| String segmentsText = getSegmentsText(); |
| byte[] buffer = Converter.wcsToMbcs(null, segmentsText, false); |
| OS.pango_layout_set_text (layout, buffer, buffer.length); |
| if (styles.length == 2 && styles[0].style == null && ascent == -1 && descent == -1) return; |
| int /*long*/ ptr = OS.pango_layout_get_text(layout); |
| attrList = OS.pango_attr_list_new(); |
| PangoAttribute attribute = new PangoAttribute(); |
| if ((ascent != -1 || descent != -1) && segmentsText.length() > 0) { |
| int /*long*/ iter = OS.pango_layout_get_iter(layout); |
| if (iter == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| PangoRectangle rect = new PangoRectangle(); |
| if (ascent != -1) rect.y = -(ascent * OS.PANGO_SCALE); |
| rect.height = (Math.max(0, ascent) + Math.max(0, descent)) * OS.PANGO_SCALE; |
| int lineCount = OS.pango_layout_get_line_count(layout); |
| char[] chars = new char[segmentsText.length() + lineCount]; |
| int oldPos = 0, count = 0; |
| do { |
| int /*long*/ attr = OS.pango_attr_shape_new (rect, rect); |
| OS.memmove (attribute, attr, PangoAttribute.sizeof); |
| int bytePos = OS.pango_layout_iter_get_index(iter); |
| attribute.start_index = bytePos + (count * 3); |
| attribute.end_index = bytePos+ 3 + (count * 3); |
| OS.memmove (attr, attribute, PangoAttribute.sizeof); |
| OS.pango_attr_list_insert(attrList, attr); |
| int pos = (int)/*64*/OS.g_utf8_pointer_to_offset(ptr, ptr + bytePos); |
| chars[pos + count] = OBJECT_REPLACEMENT_CHARACTER; |
| segmentsText.getChars(oldPos, pos, chars, oldPos + count); |
| oldPos = pos; |
| count++; |
| } while (OS.pango_layout_iter_next_line(iter)); |
| OS.pango_layout_iter_free (iter); |
| segmentsText.getChars(oldPos, segmentsText.length(), chars, oldPos + count); |
| buffer = Converter.wcsToMbcs(null, chars, false); |
| OS.pango_layout_set_text (layout, buffer, buffer.length); |
| ptr = OS.pango_layout_get_text(layout); |
| } |
| for (int i = 0; i < styles.length - 1; i++) { |
| StyleItem styleItem = styles[i]; |
| TextStyle style = styleItem.style; |
| if (style == null) continue; |
| int start = translateOffset(styleItem.start); |
| int end = translateOffset(styles[i+1].start - 1); |
| int byteStart = (int)/*64*/(OS.g_utf8_offset_to_pointer(ptr, start) - ptr); |
| int byteEnd = (int)/*64*/(OS.g_utf8_offset_to_pointer(ptr, end + 1) - ptr); |
| Font font = style.font; |
| if (font != null && !font.isDisposed()) { |
| int /*long*/ attr = OS.pango_attr_font_desc_new (font.handle); |
| OS.memmove (attribute, attr, PangoAttribute.sizeof); |
| attribute.start_index = byteStart; |
| attribute.end_index = byteEnd; |
| OS.memmove (attr, attribute, PangoAttribute.sizeof); |
| OS.pango_attr_list_insert(attrList, attr); |
| } |
| Color foreground = style.foreground; |
| if (foreground != null && !foreground.isDisposed()) { |
| GdkColor fg = foreground.handle; |
| int /*long*/ attr = OS.pango_attr_foreground_new(fg.red, fg.green, fg.blue); |
| OS.memmove (attribute, attr, PangoAttribute.sizeof); |
| attribute.start_index = byteStart; |
| attribute.end_index = byteEnd; |
| OS.memmove (attr, attribute, PangoAttribute.sizeof); |
| OS.pango_attr_list_insert(attrList, attr); |
| } |
| Color background = style.background; |
| if (background != null && !background.isDisposed()) { |
| GdkColor bg = background.handle; |
| int /*long*/ attr = OS.pango_attr_background_new(bg.red, bg.green, bg.blue); |
| OS.memmove (attribute, attr, PangoAttribute.sizeof); |
| attribute.start_index = byteStart; |
| attribute.end_index = byteEnd; |
| OS.memmove (attr, attribute, PangoAttribute.sizeof); |
| OS.pango_attr_list_insert(attrList, attr); |
| } |
| } |
| OS.pango_layout_set_attributes(layout, attrList); |
| } |
| |
| /** |
| * Disposes of the operating system resources associated with |
| * the text layout. Applications must dispose of all allocated text layouts. |
| */ |
| public void dispose() { |
| if (layout == 0) return; |
| font = null; |
| text = null; |
| freeRuns(); |
| if (layout != 0) OS.g_object_unref(layout); |
| layout = 0; |
| if (context != 0) OS.g_object_unref(context); |
| context = 0; |
| if (device.tracking) device.dispose_Object(this); |
| device = null; |
| } |
| |
| /** |
| * Draws the receiver's text using the specified GC at the specified |
| * point. |
| * |
| * @param gc the GC to draw |
| * @param x the x coordinate of the top left corner of the rectangular area where the text is to be drawn |
| * @param y the y coordinate of the top left corner of the rectangular area where the text is to be drawn |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public void draw(GC gc, int x, int y) { |
| checkLayout (); |
| computeRuns(); |
| if (gc == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| if (gc.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| OS.gdk_draw_layout(gc.data.drawable, gc.handle, x, y, layout); |
| } |
| |
| /** |
| * Draws the receiver's text using the specified GC at the specified |
| * point. |
| * |
| * @param gc the GC to draw |
| * @param x the x coordinate of the top left corner of the rectangular area where the text is to be drawn |
| * @param y the y coordinate of the top left corner of the rectangular area where the text is to be drawn |
| * @param selectionStart the offset where the selections starts, or -1 indicating no selection |
| * @param selectionEnd the offset where the selections ends, or -1 indicating no selection |
| * @param selectionForeground selection foreground, or NULL to use the system default color |
| * @param selectionBackground selection background, or NULL to use the system default color |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public void draw(GC gc, int x, int y, int selectionStart, int selectionEnd, Color selectionForeground, Color selectionBackground) { |
| checkLayout (); |
| computeRuns(); |
| if (gc == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| if (gc.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| if (selectionForeground != null && selectionForeground.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| if (selectionBackground != null && selectionBackground.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| int length = text.length(); |
| if (length == 0) return; |
| boolean hasSelection = selectionStart <= selectionEnd && selectionStart != -1 && selectionEnd != -1; |
| if (!hasSelection) { |
| OS.gdk_draw_layout(gc.data.drawable, gc.handle, x, y, layout); |
| } else { |
| selectionStart = Math.min(Math.max(0, selectionStart), length - 1); |
| selectionEnd = Math.min(Math.max(0, selectionEnd), length - 1); |
| length = (int)/*64*/OS.g_utf8_strlen(OS.pango_layout_get_text(layout), -1); |
| selectionStart = translateOffset(selectionStart); |
| selectionEnd = translateOffset(selectionEnd); |
| if (selectionForeground == null) selectionForeground = device.getSystemColor(SWT.COLOR_LIST_SELECTION_TEXT); |
| if (selectionBackground == null) selectionBackground = device.getSystemColor(SWT.COLOR_LIST_SELECTION); |
| boolean fullSelection = selectionStart == 0 && selectionEnd == length - 1; |
| if (fullSelection) { |
| OS.gdk_draw_layout_with_colors(gc.data.drawable, gc.handle, x, y, layout, selectionForeground.handle, selectionBackground.handle); |
| } else { |
| int /*long*/ ptr = OS.pango_layout_get_text(layout); |
| Region clipping = new Region(); |
| gc.getClipping(clipping); |
| int byteSelStart = (int)/*64*/(OS.g_utf8_offset_to_pointer(ptr, selectionStart) - ptr); |
| int byteSelEnd = (int)/*64*/(OS.g_utf8_offset_to_pointer(ptr, selectionEnd + 1) - ptr); |
| OS.gdk_draw_layout(gc.data.drawable, gc.handle, x, y, layout); |
| int[] ranges = new int[]{byteSelStart, byteSelEnd}; |
| int /*long*/ rgn = OS.gdk_pango_layout_get_clip_region(layout, x, y, ranges, ranges.length / 2); |
| if (rgn != 0) { |
| OS.gdk_gc_set_clip_region(gc.handle, rgn); |
| OS.gdk_region_destroy(rgn); |
| } |
| OS.gdk_draw_layout_with_colors(gc.data.drawable, gc.handle, x, y, layout, selectionForeground.handle, selectionBackground.handle); |
| gc.setClipping(clipping); |
| } |
| } |
| } |
| |
| void freeRuns() { |
| if (attrList == 0) return; |
| OS.pango_layout_set_attributes(layout, 0); |
| OS.pango_attr_list_unref(attrList); |
| attrList = 0; |
| } |
| |
| /** |
| * Returns the receiver's horizontal text alignment, which will be one |
| * of <code>SWT.LEFT</code>, <code>SWT.CENTER</code> or |
| * <code>SWT.RIGHT</code>. |
| * |
| * @return the alignment used to positioned text horizontally |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public int getAlignment() { |
| checkLayout(); |
| int align = OS.pango_layout_get_alignment(layout); |
| switch (align) { |
| case OS.PANGO_ALIGN_CENTER: return SWT.CENTER; |
| case OS.PANGO_ALIGN_RIGHT: return SWT.RIGHT; |
| } |
| return SWT.LEFT; |
| } |
| |
| /** |
| * Returns the ascent of the receiver. |
| * |
| * @return the ascent |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @see #getDescent() |
| * |
| */ |
| public int getAscent () { |
| checkLayout(); |
| return ascent; |
| } |
| |
| /** |
| * Returns the bounds of the receiver. |
| * |
| * @return the bounds of the receiver |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public Rectangle getBounds() { |
| checkLayout(); |
| computeRuns(); |
| int[] w = new int[1], h = new int[1]; |
| OS.pango_layout_get_size(layout, w, h); |
| int wrapWidth = OS.pango_layout_get_width(layout); |
| int width = OS.PANGO_PIXELS(wrapWidth != -1 ? wrapWidth : w[0]); |
| int height = OS.PANGO_PIXELS(h[0]); |
| return new Rectangle(0, 0, width, height); |
| } |
| |
| /** |
| * Returns the bounds for the specified range of characters. The |
| * bounds is the smallest rectangle that encompasses all characters |
| * in the range. The start and end offsets are inclusive and will be |
| * clamped if out of range. |
| * |
| * @param start the start offset |
| * @param end the end offset |
| * @return the bounds of the character range |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public Rectangle getBounds(int start, int end) { |
| checkLayout(); |
| computeRuns(); |
| int length = text.length(); |
| if (length == 0) return new Rectangle(0, 0, 0, 0); |
| if (start > end) return new Rectangle(0, 0, 0, 0); |
| start = Math.min(Math.max(0, start), length - 1); |
| end = Math.min(Math.max(0, end), length - 1); |
| start = translateOffset(start); |
| end = translateOffset(end); |
| int /*long*/ ptr = OS.pango_layout_get_text(layout); |
| int byteStart = (int)/*64*/(OS.g_utf8_offset_to_pointer (ptr, start) - ptr); |
| int byteEnd = (int)/*64*/(OS.g_utf8_offset_to_pointer (ptr, end + 1) - ptr); |
| int[] ranges = new int[]{byteStart, byteEnd}; |
| int /*long*/ clipRegion = OS.gdk_pango_layout_get_clip_region(layout, 0, 0, ranges, 1); |
| if (clipRegion == 0) return new Rectangle(0, 0, 0, 0); |
| GdkRectangle rect = new GdkRectangle(); |
| OS.gdk_region_get_clipbox(clipRegion, rect); |
| OS.gdk_region_destroy(clipRegion); |
| return new Rectangle(rect.x, rect.y, rect.width, rect.height); |
| } |
| |
| /** |
| * Returns the descent of the receiver. |
| * |
| * @return the descent |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @see #getAscent() |
| */ |
| public int getDescent () { |
| checkLayout(); |
| return descent; |
| } |
| |
| /** |
| * Returns the default font currently being used by the receiver |
| * to draw and measure text. |
| * |
| * @return the receiver's font |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public Font getFont () { |
| checkLayout(); |
| return font; |
| } |
| |
| /** |
| * Returns the embedding level for the specified character offset. The |
| * embedding level is usually used to determine the directionality of a |
| * character in bidirectional text. |
| * |
| * @param offset the charecter offset |
| * @return the embedding level |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_INVALID_ARGUMENT - if the character offset is out of range</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| */ |
| public int getLevel(int offset) { |
| checkLayout(); |
| computeRuns(); |
| int length = text.length(); |
| if (!(0 <= offset && offset <= length)) SWT.error(SWT.ERROR_INVALID_RANGE); |
| offset = translateOffset(offset); |
| int /*long*/ iter = OS.pango_layout_get_iter(layout); |
| if (iter == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| int level = 0; |
| PangoItem item = new PangoItem(); |
| PangoLayoutRun run = new PangoLayoutRun(); |
| int /*long*/ ptr = OS.pango_layout_get_text(layout); |
| int /*long*/ byteOffset = OS.g_utf8_offset_to_pointer(ptr, offset) - ptr; |
| do { |
| int /*long*/ runPtr = OS.pango_layout_iter_get_run(iter); |
| if (runPtr != 0) { |
| OS.memmove(run, runPtr, PangoLayoutRun.sizeof); |
| OS.memmove(item, run.item, PangoItem.sizeof); |
| if (item.offset <= byteOffset && byteOffset < item.offset + item.length) { |
| level = item.analysis_level; |
| break; |
| } |
| } |
| } while (OS.pango_layout_iter_next_run(iter)); |
| OS.pango_layout_iter_free(iter); |
| return level; |
| } |
| |
| /** |
| * Returns the bounds of the line for the specified line index. |
| * |
| * @param lineIndex the line index |
| * @return the line bounds |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_INVALID_ARGUMENT - if the line index is out of range</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public Rectangle getLineBounds(int lineIndex) { |
| checkLayout(); |
| computeRuns(); |
| int lineCount = OS.pango_layout_get_line_count(layout); |
| if (!(0 <= lineIndex && lineIndex < lineCount)) SWT.error(SWT.ERROR_INVALID_RANGE); |
| int /*long*/ iter = OS.pango_layout_get_iter(layout); |
| if (iter == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| for (int i = 0; i < lineIndex; i++) OS.pango_layout_iter_next_line(iter); |
| PangoRectangle rect = new PangoRectangle(); |
| OS.pango_layout_iter_get_line_extents(iter, null, rect); |
| OS.pango_layout_iter_free(iter); |
| int x = OS.PANGO_PIXELS(rect.x); |
| int y = OS.PANGO_PIXELS(rect.y); |
| int width = OS.PANGO_PIXELS(rect.width); |
| int height = OS.PANGO_PIXELS(rect.height); |
| return new Rectangle(x, y, width, height); |
| } |
| |
| /** |
| * Returns the receiver's line count. This includes lines caused |
| * by wrapping. |
| * |
| * @return the line count |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public int getLineCount() { |
| checkLayout (); |
| computeRuns(); |
| return OS.pango_layout_get_line_count(layout); |
| } |
| |
| /** |
| * Returns the index of the line that contains the specified |
| * character offset. |
| * |
| * @param offset the character offset |
| * @return the line index |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_INVALID_ARGUMENT - if the character offset is out of range</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public int getLineIndex(int offset) { |
| checkLayout (); |
| computeRuns(); |
| int length = text.length(); |
| if (!(0 <= offset && offset <= length)) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| offset = translateOffset(offset); |
| int line = 0; |
| int /*long*/ ptr = OS.pango_layout_get_text(layout); |
| int /*long*/ byteOffset = OS.g_utf8_offset_to_pointer(ptr,offset) - ptr; |
| int /*long*/ iter = OS.pango_layout_get_iter(layout); |
| if (iter == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| while (OS.pango_layout_iter_next_line(iter)) { |
| if (OS.pango_layout_iter_get_index(iter) > byteOffset) break; |
| line++; |
| } |
| OS.pango_layout_iter_free(iter); |
| return line; |
| } |
| |
| /** |
| * Returns the font metrics for the specified line index. |
| * |
| * @param lineIndex the line index |
| * @return the font metrics |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_INVALID_ARGUMENT - if the line index is out of range</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public FontMetrics getLineMetrics (int lineIndex) { |
| checkLayout (); |
| computeRuns(); |
| int lineCount = OS.pango_layout_get_line_count(layout); |
| if (!(0 <= lineIndex && lineIndex < lineCount)) SWT.error(SWT.ERROR_INVALID_RANGE); |
| int /*long*/ font = this.font != null ? this.font.handle : device.getSystemFont().handle; |
| int /*long*/ lang = OS.pango_context_get_language(context); |
| int ascent = 0, descent = 0, averageCharWidth = 0, height = 0; |
| int /*long*/ metrics = OS.pango_context_get_metrics(context, font, lang); |
| if (text.length() == 0) { |
| ascent = OS.pango_font_metrics_get_ascent(metrics); |
| descent = OS.pango_font_metrics_get_descent(metrics); |
| averageCharWidth = OS.pango_font_metrics_get_approximate_char_width(metrics); |
| height = ascent + descent; |
| } else { |
| PangoLayoutLine line = new PangoLayoutLine(); |
| OS.memmove(line, OS.pango_layout_get_line(layout, lineIndex), PangoLayoutLine.sizeof); |
| int /*long*/ runs = line.runs; |
| PangoItem item = new PangoItem(); |
| PangoLayoutRun run = new PangoLayoutRun(); |
| int runCount = 0; |
| ascent = Math.max(0, this.ascent * OS.PANGO_SCALE); |
| descent = Math.max(0, this.descent * OS.PANGO_SCALE); |
| while (runs != 0) { |
| OS.memmove(run, OS.g_slist_data(runs), PangoLayoutRun.sizeof); |
| OS.memmove(item, run.item, PangoItem.sizeof); |
| int /*long*/ runMetrics = metrics; |
| if (item.analysis_font != 0) { |
| runMetrics = OS.pango_font_get_metrics(item.analysis_font, item.analysis_language); |
| } |
| int runAscent = OS.pango_font_metrics_get_ascent(runMetrics); |
| int runDescent = OS.pango_font_metrics_get_descent(runMetrics); |
| ascent = Math.max(ascent, runAscent); |
| descent = Math.max(descent, runDescent); |
| averageCharWidth += OS.pango_font_metrics_get_approximate_char_width(runMetrics); |
| height = Math.max(height, runAscent + runDescent); |
| if (metrics != runMetrics) OS.pango_font_metrics_unref(runMetrics); |
| runCount++; |
| runs = OS.g_slist_next(runs); |
| } |
| averageCharWidth = averageCharWidth / runCount; |
| } |
| OS.pango_font_metrics_unref(metrics); |
| ascent = OS.PANGO_PIXELS(ascent); |
| descent = OS.PANGO_PIXELS(descent); |
| averageCharWidth = OS.PANGO_PIXELS(averageCharWidth); |
| height = OS.PANGO_PIXELS(height); |
| return FontMetrics.gtk_new(ascent, descent, averageCharWidth, 0, height); |
| } |
| |
| /** |
| * Returns the line offsets. Each value in the array is the |
| * offset for the first character in a line except for the last |
| * value, which contains the length of the text. |
| * |
| * @return the line offsets |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public int[] getLineOffsets() { |
| checkLayout(); |
| computeRuns(); |
| int lineCount = OS.pango_layout_get_line_count(layout); |
| int[] offsets = new int [lineCount + 1]; |
| int /*long*/ ptr = OS.pango_layout_get_text(layout); |
| int /*long*/ iter = OS.pango_layout_get_iter(layout); |
| if (iter == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| int i = 0; |
| do { |
| int bytePos = OS.pango_layout_iter_get_index(iter); |
| int pos = (int)/*64*/OS.g_utf8_pointer_to_offset(ptr, ptr + bytePos); |
| offsets[i++] = untranslateOffset(pos); |
| } while (OS.pango_layout_iter_next_line(iter)); |
| offsets[lineCount] = text.length(); |
| return offsets; |
| } |
| |
| /** |
| * Returns the location for the specified character offset. The |
| * <code>trailing</code> argument indicates whether the offset |
| * corresponds to the leading or trailing edge of the cluster. |
| * |
| * @param offset the character offset |
| * @param trailing the trailing flag |
| * @return the location of the character offset |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @see #getOffset(Point, int[]) |
| * @see #getOffset(int, int, int[]) |
| */ |
| public Point getLocation(int offset, boolean trailing) { |
| checkLayout(); |
| computeRuns(); |
| int length = text.length(); |
| if (!(0 <= offset && offset <= length)) SWT.error(SWT.ERROR_INVALID_RANGE); |
| offset = translateOffset(offset); |
| int /*long*/ ptr = OS.pango_layout_get_text(layout); |
| int byteOffset = (int)/*64*/(OS.g_utf8_offset_to_pointer(ptr, offset) - ptr); |
| PangoRectangle pos = new PangoRectangle(); |
| OS.pango_layout_index_to_pos(layout, byteOffset, pos); |
| int x = trailing ? pos.x + pos.width : pos.x; |
| int y = pos.y; |
| return new Point(OS.PANGO_PIXELS(x), OS.PANGO_PIXELS(y)); |
| } |
| |
| /** |
| * Returns the next offset for the specified offset and movement |
| * type. The movement is one of <code>SWT.MOVEMENT_CHAR</code>, |
| * <code>SWT.MOVEMENT_CLUSTER</code> or <code>SWT.MOVEMENT_WORD</code>. |
| * |
| * @param offset the start offset |
| * @param movement the movement type |
| * @return the next offset |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_INVALID_ARGUMENT - if the offset is out of range</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @see #getPreviousOffset(int, int) |
| */ |
| public int getNextOffset (int offset, int movement) { |
| return _getOffset(offset, movement, true); |
| } |
| |
| int _getOffset (int offset, int movement, boolean forward) { |
| checkLayout(); |
| int length = text.length(); |
| if (!(0 <= offset && offset <= length)) SWT.error(SWT.ERROR_INVALID_RANGE); |
| if (forward) { |
| if (offset == length) return length; |
| } else { |
| if (offset == 0) return 0; |
| } |
| int step = forward ? 1 : -1; |
| if ((movement & SWT.MOVEMENT_CHAR) != 0) return offset + step; |
| int /*long*/[] attrs = new int /*long*/[1]; |
| int[] nAttrs = new int[1]; |
| OS.pango_layout_get_log_attrs(layout, attrs, nAttrs); |
| if (attrs[0] == 0) return offset + step; |
| length = (int)/*64*/OS.g_utf8_strlen(OS.pango_layout_get_text(layout), -1); |
| offset = translateOffset(offset); |
| PangoLogAttr logAttr = new PangoLogAttr(); |
| offset = validateOffset(offset, step); |
| while (0 < offset && offset < length) { |
| OS.memmove(logAttr, attrs[0] + offset * PangoLogAttr.sizeof, PangoLogAttr.sizeof); |
| if (((movement & SWT.MOVEMENT_CLUSTER) != 0) && logAttr.is_cursor_position) break; |
| if (((movement & SWT.MOVEMENT_WORD) != 0) && (logAttr.is_word_start || logAttr.is_sentence_end)) break; |
| offset = validateOffset(offset, step); |
| } |
| OS.g_free(attrs[0]); |
| return Math.min(Math.max(0, untranslateOffset(offset)), text.length()); |
| } |
| |
| /** |
| * Returns the character offset for the specified point. When |
| * the point is over a cluster composed by multiple characters, |
| * the trailing argument will determine for each character in the |
| * cluster whether it is under the point. |
| * |
| * @param point the point |
| * @param trailing the trailing buffer |
| * @return the character offset |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_INVALID_ARGUMENT - if the trailing length is less than <code>1</code></li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @see #getLocation(int, boolean) |
| */ |
| public int getOffset(Point point, int[] trailing) { |
| checkLayout(); |
| if (point == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| return getOffset(point.x, point.y, trailing); |
| } |
| |
| /** |
| * Returns the character offset for the specified point. When |
| * the point is over a cluster composed by multiple characters, |
| * the trailing argument will determine for each character in the |
| * cluster whether it is under the point. |
| * |
| * @param x the x coordinate of the point |
| * @param y the y coordinate of the point |
| * @param trailing the trailing buffer |
| * @return the character offset |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_INVALID_ARGUMENT - if the trailing length is less than <code>1</code></li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @see #getLocation(int, boolean) |
| */ |
| public int getOffset(int x, int y, int[] trailing) { |
| checkLayout(); |
| computeRuns(); |
| if (trailing != null && trailing.length < 1) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| int[] index = new int[1]; |
| int[] piTrailing = new int[1]; |
| OS.pango_layout_xy_to_index(layout, x * OS.PANGO_SCALE, y * OS.PANGO_SCALE, index, piTrailing); |
| int /*long*/ ptr = OS.pango_layout_get_text(layout); |
| int offset = (int)/*64*/OS.g_utf8_pointer_to_offset(ptr, ptr + index[0]); |
| if (trailing != null) trailing[0] = piTrailing[0]; |
| return untranslateOffset(offset); |
| } |
| |
| /** |
| * Returns the orientation of the receiver. |
| * |
| * @return the orientation style |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public int getOrientation() { |
| checkLayout(); |
| int baseDir = OS.pango_context_get_base_dir(context); |
| return baseDir == OS.PANGO_DIRECTION_RTL ? SWT.RIGHT_TO_LEFT : SWT.LEFT_TO_RIGHT; |
| } |
| |
| /** |
| * Returns the previous offset for the specified offset and movement |
| * type. The movement is one of <code>SWT.MOVEMENT_CHAR</code>, |
| * <code>SWT.MOVEMENT_CLUSTER</code> or <code>SWT.MOVEMENT_WORD</code>. |
| * |
| * @param offset the start offset |
| * @param movement the movement type |
| * @return the previous offset |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_INVALID_ARGUMENT - if the offset is out of range</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @see #getNextOffset(int, int) |
| */ |
| public int getPreviousOffset (int index, int movement) { |
| return _getOffset(index, movement, false); |
| } |
| |
| /** |
| * Returns the text segments offsets of the receiver. |
| * |
| * @return the text segments offsets |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public int[] getSegments() { |
| checkLayout(); |
| return segments; |
| } |
| |
| String getSegmentsText() { |
| if (segments == null) return text; |
| int nSegments = segments.length; |
| if (nSegments <= 1) return text; |
| int length = text.length(); |
| if (length == 0) return text; |
| if (nSegments == 2) { |
| if (segments[0] == 0 && segments[1] == length) return text; |
| } |
| char[] oldChars = new char[length]; |
| text.getChars(0, length, oldChars, 0); |
| char[] newChars = new char[length + nSegments]; |
| int charCount = 0, segmentCount = 0; |
| char separator = getOrientation() == SWT.RIGHT_TO_LEFT ? RTL_MARK : LTR_MARK; |
| while (charCount < length) { |
| if (segmentCount < nSegments && charCount == segments[segmentCount]) { |
| newChars[charCount + segmentCount++] = separator; |
| } else { |
| newChars[charCount + segmentCount] = oldChars[charCount++]; |
| } |
| } |
| if (segmentCount < nSegments) { |
| segments[segmentCount] = charCount; |
| newChars[charCount + segmentCount++] = separator; |
| } |
| return new String(newChars, 0, Math.min(charCount + segmentCount, newChars.length)); |
| } |
| |
| /** |
| * Returns the line spacing of the receiver. |
| * |
| * @return the line spacing |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public int getSpacing () { |
| checkLayout(); |
| return OS.PANGO_PIXELS(OS.pango_layout_get_spacing(layout)); |
| } |
| |
| /** |
| * Gets the style of the receiver at the specified offset. |
| * |
| * @param offset the text offset |
| * @return the style or <code>null</code> if not set |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public TextStyle getStyle (int offset) { |
| checkLayout(); |
| int length = text.length(); |
| if (!(0 <= offset && offset < length)) SWT.error(SWT.ERROR_INVALID_RANGE); |
| for (int i=1; i<styles.length; i++) { |
| StyleItem item = styles[i]; |
| if (item.start > offset) { |
| return styles[i - 1].style; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Returns the tab list of the receiver. |
| * |
| * @return the tab list |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public int[] getTabs() { |
| checkLayout(); |
| int /*long*/ tabArray = OS.pango_layout_get_tabs(layout); |
| if (tabArray == 0) return null; |
| int nTabs = OS.pango_tab_array_get_size(tabArray); |
| int[] tabs = new int[nTabs]; |
| if (nTabs > 0) { |
| int /*long*/[] locations = new int /*long*/[1]; |
| OS.pango_tab_array_get_tabs(tabArray, null, locations); |
| if (locations[0] != 0) { |
| OS.memmove(tabs, locations[0], nTabs * 4); |
| OS.g_free(locations[0]); |
| } |
| } |
| OS.pango_tab_array_free(tabArray); |
| return tabs; |
| } |
| |
| /** |
| * Gets the receiver's text, which will be an empty |
| * string if it has never been set. |
| * |
| * @return the receiver's text |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public String getText () { |
| checkLayout (); |
| return text; |
| } |
| |
| /** |
| * Returns the width of the receiver. |
| * |
| * @return the width |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public int getWidth () { |
| checkLayout (); |
| return OS.PANGO_PIXELS(OS.pango_layout_get_width(layout)); |
| } |
| |
| /** |
| * Returns <code>true</code> if the text layout has been disposed, |
| * and <code>false</code> otherwise. |
| * <p> |
| * This method gets the dispose state for the text layout. |
| * When a text layout has been disposed, it is an error to |
| * invoke any other method using the text layout. |
| * |
| * @return <code>true</code> when the text layout is disposed and <code>false</code> otherwise |
| */ |
| public boolean isDisposed () { |
| return layout == 0; |
| } |
| |
| /** |
| * Sets the text alignment for the receiver. The alignment controls |
| * how a line of text is positioned horizontally. The argument should |
| * be one of <code>SWT.LEFT</code>, <code>SWT.RIGHT</code> or <code>SWT.CENTER</code>. |
| * <p> |
| * The default alignment is <code>SWT.LEFT</code>. Note that the receiver's |
| * width must be set in order to use <code>SWT.RIGHT</code> or <code>SWT.CENTER</code> |
| * alignment. |
| *</p> |
| * |
| * @param alignment the new alignment |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @see #setWidth(int) |
| */ |
| public void setAlignment (int alignment) { |
| checkLayout(); |
| int mask = SWT.LEFT | SWT.CENTER | SWT.RIGHT; |
| alignment &= mask; |
| if (alignment == 0) return; |
| if ((alignment & SWT.LEFT) != 0) alignment = SWT.LEFT; |
| if ((alignment & SWT.RIGHT) != 0) alignment = SWT.RIGHT; |
| int align = OS.PANGO_ALIGN_LEFT; |
| switch (alignment) { |
| case SWT.CENTER: align = OS.PANGO_ALIGN_CENTER; break; |
| case SWT.RIGHT: align = OS.PANGO_ALIGN_RIGHT; break; |
| } |
| OS.pango_layout_set_alignment(layout, align); |
| } |
| |
| /** |
| * Sets the ascent of the receiver. The ascent is distance in pixels |
| * from the baseline to the top of the line and it is applied to all |
| * lines. The default value is <code>-1</code> which means that the |
| * ascent is calculated from the line fonts. |
| * |
| * @param ascent the new ascent |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_INVALID_ARGUMENT - if the ascent is less than <code>-1</code></li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @see #setDescent(int) |
| */ |
| public void setAscent (int ascent) { |
| checkLayout(); |
| if (ascent < -1) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| if (this.ascent == ascent) return; |
| freeRuns(); |
| this.ascent = ascent; |
| } |
| |
| /** |
| * Sets the descent of the receiver. The descent is distance in pixels |
| * from the baseline to the bottom of the line and it is applied to all |
| * lines. The default value is <code>-1</code> which means that the |
| * descent is calculated from the line fonts. |
| * |
| * @param descent the new descent |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_INVALID_ARGUMENT - if the descent is less than <code>-1</code></li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @see #setAscent(int) |
| */ |
| public void setDescent (int descent) { |
| checkLayout(); |
| if (descent < -1) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| if (this.descent == descent) return; |
| freeRuns(); |
| this.descent = descent; |
| } |
| |
| /** |
| * Sets the default font which will be used by the receiver |
| * to draw and measure text. If the |
| * argument is null, then a default font appropriate |
| * for the platform will be used instead. Note that a text |
| * style can override the default font. |
| * |
| * @param font the new font for the receiver, or null to indicate a default font |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_INVALID_ARGUMENT - if the font has been disposed</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public void setFont (Font font) { |
| checkLayout (); |
| if (font != null && font.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| if (this.font == font) return; |
| if (font != null && font.equals(this.font)) return; |
| this.font = font; |
| OS.pango_layout_set_font_description(layout, font != null ? font.handle : 0); |
| } |
| |
| /** |
| * Sets the orientation of the receiver, which must be one |
| * of <code>SWT.LEFT_TO_RIGHT</code> or <code>SWT.RIGHT_TO_LEFT</code>. |
| * <p> |
| * |
| * @param orientation new orientation style |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public void setOrientation(int orientation) { |
| checkLayout(); |
| int mask = SWT.RIGHT_TO_LEFT | SWT.LEFT_TO_RIGHT; |
| orientation &= mask; |
| if (orientation == 0) return; |
| if ((orientation & SWT.LEFT_TO_RIGHT) != 0) orientation = SWT.LEFT_TO_RIGHT; |
| int baseDir = orientation == SWT.RIGHT_TO_LEFT ? OS.PANGO_DIRECTION_RTL : OS.PANGO_DIRECTION_LTR; |
| if (OS.pango_context_get_base_dir(context) == baseDir) return; |
| OS.pango_context_set_base_dir(context, baseDir); |
| OS.pango_layout_context_changed(layout); |
| } |
| |
| /** |
| * Sets the line spacing of the receiver. The line spacing |
| * is the space left between lines. |
| * |
| * @param spacing the new line spacing |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_INVALID_ARGUMENT - if the spacing is negative</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public void setSpacing (int spacing) { |
| checkLayout(); |
| if (spacing < 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| OS.pango_layout_set_spacing(layout, spacing * OS.PANGO_SCALE); |
| } |
| |
| /** |
| * Sets the offsets of the receiver's text segments. Text segments are used to |
| * override the default behaviour of the bidirectional algorithm. |
| * Bidirectional reordering can happen within a text segment but not |
| * between two adjacent segments. |
| * Each text segment is determined by two consecutive offsets in the |
| * <code>segments</code> arrays. The first element of the array should |
| * always be zero and the last one should always be equals to length of |
| * the text. |
| * <p> |
| * |
| * @param segments the text segments offset |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public void setSegments(int[] segments) { |
| checkLayout(); |
| if (this.segments == null && segments == null) return; |
| if (this.segments != null && segments !=null) { |
| if (this.segments.length == segments.length) { |
| int i; |
| for (i = 0; i <segments.length; i++) { |
| if (this.segments[i] != segments[i]) break; |
| } |
| if (i == segments.length) return; |
| } |
| } |
| freeRuns(); |
| this.segments = segments; |
| } |
| |
| /** |
| * Sets the style of the receiver for the specified range. Styles previously |
| * set for that range will be overwritten. The start and end offsets are |
| * inclusive and will be clamped if out of range. |
| * |
| * @param style the style |
| * @param start the start offset |
| * @param end the end offset |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public void setStyle (TextStyle style, int start, int end) { |
| checkLayout(); |
| int length = text.length(); |
| if (length == 0) return; |
| if (start > end) return; |
| start = Math.min(Math.max(0, start), length - 1); |
| end = Math.min(Math.max(0, end), length - 1); |
| |
| /* |
| * Bug in Pango. Pango 1.2.2 will cause a segmentation fault if a style |
| * is not applied for a whole ligature. The fix is to applied the |
| * style for the whole ligature. |
| * |
| * NOTE that fix only LamAlef ligatures. |
| */ |
| if (start > 0 && isAlef(text.charAt(start)) && isLam(text.charAt(start - 1))) { |
| start--; |
| } |
| if (end < length - 1 && isLam(text.charAt(end)) && isAlef(text.charAt(end + 1))) { |
| end++; |
| } |
| |
| int low = -1; |
| int high = styles.length; |
| while (high - low > 1) { |
| int index = (high + low) / 2; |
| if (start <= styles[index].start) { |
| high = index; |
| } else { |
| low = index; |
| } |
| } |
| if (0 <= high && high < styles.length) { |
| StyleItem item = styles[high]; |
| if (item.start == start && styles[high + 1].start - 1 == end) { |
| if (style == item.style) return; |
| if (style != null && style.equals(item.style)) return; |
| } |
| } |
| freeRuns(); |
| int count = 0, i; |
| StyleItem[] newStyles = new StyleItem[styles.length + 2]; |
| for (i = 0; i < styles.length; i++) { |
| StyleItem item = styles[i]; |
| if (item.start >= start) break; |
| newStyles[count++] = item; |
| } |
| StyleItem newItem = new StyleItem(); |
| newItem.start = start; |
| newItem.style = style; |
| newStyles[count++] = newItem; |
| if (styles[i].start > end) { |
| newItem = new StyleItem(); |
| newItem.start = end + 1; |
| newItem.style = styles[i -1].style; |
| newStyles[count++] = newItem; |
| } else { |
| for (; i<styles.length; i++) { |
| StyleItem item = styles[i]; |
| if (item.start > end) break; |
| } |
| if (end != styles[i].start - 1) { |
| i--; |
| styles[i].start = end + 1; |
| } |
| } |
| for (; i<styles.length; i++) { |
| StyleItem item = styles[i]; |
| if (item.start > end) newStyles[count++] = item; |
| } |
| if (newStyles.length != count) { |
| styles = new StyleItem[count]; |
| System.arraycopy(newStyles, 0, styles, 0, count); |
| } else { |
| styles = newStyles; |
| } |
| } |
| |
| /** |
| * Sets the receiver's tab list. Each value in the tab list specifies |
| * the space in pixels from the origin of the text layout to the respective |
| * tab stop. The last tab stop width is repeated continuously. |
| * |
| * @param tabs the new tab list |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public void setTabs(int[] tabs) { |
| checkLayout(); |
| if (tabs == null) { |
| OS.pango_layout_set_tabs(layout, device.emptyTab); |
| } else { |
| int /*long*/ tabArray = OS.pango_tab_array_new(tabs.length, true); |
| if (tabArray != 0) { |
| for (int i = 0; i < tabs.length; i++) { |
| OS.pango_tab_array_set_tab(tabArray, i, OS.PANGO_TAB_LEFT, tabs[i]); |
| } |
| OS.pango_layout_set_tabs(layout, tabArray); |
| OS.pango_tab_array_free(tabArray); |
| } |
| } |
| } |
| |
| /** |
| * Sets the receiver's text. |
| * |
| * @param text the new text |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the text is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public void setText (String text) { |
| checkLayout (); |
| if (text == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| if (text.equals(this.text)) return; |
| freeRuns(); |
| this.text = text; |
| styles = new StyleItem[2]; |
| styles[0] = new StyleItem(); |
| styles[1] = new StyleItem(); |
| styles[styles.length - 1].start = text.length(); |
| } |
| |
| /** |
| * Sets the line width of the receiver, which determines how |
| * text should be wrapped and aligned. The default value is |
| * <code>-1</code> which means wrapping is disabled. |
| * |
| * @param width the new width |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_INVALID_ARGUMENT - if the width is <code>0</code> or less than <code>-1</code></li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @see #setAlignment(int) |
| */ |
| public void setWidth (int width) { |
| checkLayout (); |
| if (width < -1 || width == 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| OS.pango_layout_set_width(layout, width == -1 ? -1 : width * OS.PANGO_SCALE); |
| } |
| |
| static final boolean isLam(int ch) { |
| return ch == 0x0644; |
| } |
| |
| static final boolean isAlef(int ch) { |
| switch (ch) { |
| case 0x0622: |
| case 0x0623: |
| case 0x0625: |
| case 0x0627: |
| case 0x0649: |
| case 0x0670: |
| case 0x0671: |
| case 0x0672: |
| case 0x0673: |
| case 0x0675: |
| return true; |
| } |
| return false; |
| } |
| |
| /* |
| * Translate a client offset to an internal offset |
| */ |
| int translateOffset(int offset) { |
| int length = text.length(); |
| if (length == 0) return offset; |
| if (ascent != -1 || descent != -1) { |
| int /*long*/ ptr = OS.pango_layout_get_text(layout); |
| int /*long*/ iter = OS.pango_layout_get_iter(layout); |
| if (iter == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| int count = 0; |
| do { |
| int bytePos = OS.pango_layout_iter_get_index(iter); |
| int pos = (int)/*64*/OS.g_utf8_pointer_to_offset(ptr, ptr + bytePos); |
| if (pos - count > offset) break; |
| count++; |
| } while (OS.pango_layout_iter_next_line(iter)); |
| OS.pango_layout_iter_free (iter); |
| offset += count; |
| } |
| if (segments == null) return offset; |
| int nSegments = segments.length; |
| if (nSegments <= 1) return offset; |
| if (nSegments == 2) { |
| if (segments[0] == 0 && segments[1] == length) return offset; |
| } |
| for (int i = 0; i < nSegments && offset - i >= segments[i]; i++) { |
| offset++; |
| } |
| return offset; |
| } |
| |
| /* |
| * Translate an internal offset to a client offset |
| */ |
| int untranslateOffset(int offset) { |
| int length = text.length(); |
| if (length == 0) return offset; |
| if (ascent != -1 || descent != -1) { |
| int /*long*/ ptr = OS.pango_layout_get_text(layout); |
| int /*long*/ iter = OS.pango_layout_get_iter(layout); |
| if (iter == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| int count = 0; |
| do { |
| int bytePos = OS.pango_layout_iter_get_index(iter); |
| int pos = (int)/*64*/OS.g_utf8_pointer_to_offset(ptr, ptr + bytePos); |
| if (pos >= offset) break; |
| count++; |
| } while (OS.pango_layout_iter_next_line(iter)); |
| OS.pango_layout_iter_free (iter); |
| offset -= count; |
| } |
| if (segments == null) return offset; |
| int nSegments = segments.length; |
| if (nSegments <= 1) return offset; |
| if (nSegments == 2) { |
| if (segments[0] == 0 && segments[1] == length) return offset; |
| } |
| for (int i = 0; i < nSegments && offset > segments[i]; i++) { |
| offset--; |
| } |
| return offset; |
| } |
| |
| int validateOffset(int offset, int step) { |
| offset += step; |
| int pos; |
| int /*long*/ iter; |
| int /*long*/ ptr = OS.pango_layout_get_text(layout); |
| if (ascent != -1 || descent != -1) { |
| iter = OS.pango_layout_get_iter(layout); |
| if (iter == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| do { |
| int bytePos = OS.pango_layout_iter_get_index(iter); |
| pos = (int)/*64*/OS.g_utf8_pointer_to_offset(ptr, ptr + bytePos); |
| if (pos == offset) { |
| offset += step; |
| break; |
| } |
| } while (OS.pango_layout_iter_next_line(iter) && offset > pos); |
| OS.pango_layout_iter_free (iter); |
| } |
| if (segments != null && segments.length > 2) { |
| for (int j = 0; j < segments.length; j++) { |
| if (translateOffset(segments[j]) - 1 == offset) { |
| offset += step; |
| break; |
| } |
| } |
| } |
| return offset; |
| } |
| |
| } |