| /******************************************************************************* |
| * Copyright (c) 2000, 2012 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.swt.widgets; |
| |
| |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.events.*; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.internal.win32.*; |
| |
| /** |
| * Instances of this class are selectable user interface |
| * objects that represent a range of positive, numeric values. |
| * <p> |
| * At any given moment, a given slider will have a |
| * single 'selection' that is considered to be its |
| * value, which is constrained to be within the range of |
| * values the slider represents (that is, between its |
| * <em>minimum</em> and <em>maximum</em> values). |
| * </p><p> |
| * Typically, sliders will be made up of five areas: |
| * </p> |
| * <ol> |
| * <li>an arrow button for decrementing the value</li> |
| * <li>a page decrement area for decrementing the value by a larger amount</li> |
| * <li>a <em>thumb</em> for modifying the value by mouse dragging</li> |
| * <li>a page increment area for incrementing the value by a larger amount</li> |
| * <li>an arrow button for incrementing the value</li> |
| * </ol> |
| * <p> |
| * Based on their style, sliders are either <code>HORIZONTAL</code> |
| * (which have a left facing button for decrementing the value and a |
| * right facing button for incrementing it) or <code>VERTICAL</code> |
| * (which have an upward facing button for decrementing the value |
| * and a downward facing buttons for incrementing it). |
| * </p><p> |
| * On some platforms, the size of the slider's thumb can be |
| * varied relative to the magnitude of the range of values it |
| * represents (that is, relative to the difference between its |
| * maximum and minimum values). Typically, this is used to |
| * indicate some proportional value such as the ratio of the |
| * visible area of a document to the total amount of space that |
| * it would take to display it. SWT supports setting the thumb |
| * size even if the underlying platform does not, but in this |
| * case the appearance of the slider will not change. |
| * </p> |
| * <dl> |
| * <dt><b>Styles:</b></dt> |
| * <dd>HORIZONTAL, VERTICAL</dd> |
| * <dt><b>Events:</b></dt> |
| * <dd>Selection</dd> |
| * </dl> |
| * <p> |
| * Note: Only one of the styles HORIZONTAL and VERTICAL may be specified. |
| * </p><p> |
| * IMPORTANT: This class is <em>not</em> intended to be subclassed. |
| * </p> |
| * |
| * @see ScrollBar |
| * @see <a href="http://www.eclipse.org/swt/snippets/#slider">Slider snippets</a> |
| * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: ControlExample</a> |
| * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> |
| * @noextend This class is not intended to be subclassed by clients. |
| */ |
| public class Slider extends Control { |
| int increment, pageIncrement; |
| boolean ignoreFocus; |
| static final long ScrollBarProc; |
| static final TCHAR ScrollBarClass = new TCHAR (0, "SCROLLBAR", true); |
| static { |
| WNDCLASS lpWndClass = new WNDCLASS (); |
| OS.GetClassInfo (0, ScrollBarClass, lpWndClass); |
| ScrollBarProc = lpWndClass.lpfnWndProc; |
| } |
| |
| /** |
| * Constructs a new instance of this class given its parent |
| * and a style value describing its behavior and appearance. |
| * <p> |
| * The style value is either one of the style constants defined in |
| * class <code>SWT</code> which is applicable to instances of this |
| * class, or must be built by <em>bitwise OR</em>'ing together |
| * (that is, using the <code>int</code> "|" operator) two or more |
| * of those <code>SWT</code> style constants. The class description |
| * lists the style constants that are applicable to the class. |
| * Style bits are also inherited from superclasses. |
| * </p> |
| * |
| * @param parent a composite control which will be the parent of the new instance (cannot be null) |
| * @param style the style of control to construct |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the parent is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li> |
| * <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li> |
| * </ul> |
| * |
| * @see SWT#HORIZONTAL |
| * @see SWT#VERTICAL |
| * @see Widget#checkSubclass |
| * @see Widget#getStyle |
| */ |
| public Slider (Composite parent, int style) { |
| super (parent, checkStyle (style)); |
| } |
| |
| /** |
| * Adds the listener to the collection of listeners who will |
| * be notified when the user changes the receiver's value, by sending |
| * it one of the messages defined in the <code>SelectionListener</code> |
| * interface. |
| * <p> |
| * When <code>widgetSelected</code> is called, the event object detail field contains one of the following values: |
| * <code>SWT.NONE</code> - for the end of a drag. |
| * <code>SWT.DRAG</code>. |
| * <code>SWT.HOME</code>. |
| * <code>SWT.END</code>. |
| * <code>SWT.ARROW_DOWN</code>. |
| * <code>SWT.ARROW_UP</code>. |
| * <code>SWT.PAGE_DOWN</code>. |
| * <code>SWT.PAGE_UP</code>. |
| * <code>widgetDefaultSelected</code> is not called. |
| * </p> |
| * |
| * @param listener the listener which should be notified when the user changes the receiver's value |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the listener is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| * |
| * @see SelectionListener |
| * @see #removeSelectionListener |
| * @see SelectionEvent |
| */ |
| public void addSelectionListener (SelectionListener listener) { |
| checkWidget (); |
| if (listener == null) error (SWT.ERROR_NULL_ARGUMENT); |
| TypedListener typedListener = new TypedListener(listener); |
| addListener (SWT.Selection,typedListener); |
| addListener (SWT.DefaultSelection,typedListener); |
| } |
| |
| @Override |
| long callWindowProc (long hwnd, int msg, long wParam, long lParam) { |
| if (handle == 0) return 0; |
| /* |
| * Feature in Windows. Windows runs a modal message |
| * loop when the user drags a scroll bar. This means |
| * that mouse down events won't get delivered until |
| * after the loop finishes. The fix is to run any |
| * deferred messages, including mouse down messages |
| * before calling the scroll bar window proc. |
| */ |
| switch (msg) { |
| case OS.WM_LBUTTONDOWN: |
| case OS.WM_LBUTTONDBLCLK: |
| display.runDeferredEvents (); |
| } |
| return OS.CallWindowProc (ScrollBarProc, hwnd, msg, wParam, lParam); |
| } |
| |
| static int checkStyle (int style) { |
| return checkBits (style, SWT.HORIZONTAL, SWT.VERTICAL, 0, 0, 0, 0); |
| } |
| |
| @Override Point computeSizeInPixels (int wHint, int hHint, boolean changed) { |
| checkWidget (); |
| int border = getBorderWidthInPixels (); |
| int width = border * 2, height = border * 2; |
| if ((style & SWT.HORIZONTAL) != 0) { |
| width += OS.GetSystemMetrics (OS.SM_CXHSCROLL) * 10; |
| height += OS.GetSystemMetrics (OS.SM_CYHSCROLL); |
| } else { |
| width += OS.GetSystemMetrics (OS.SM_CXVSCROLL); |
| height += OS.GetSystemMetrics (OS.SM_CYVSCROLL) * 10; |
| } |
| if (wHint != SWT.DEFAULT) width = wHint + (border * 2); |
| if (hHint != SWT.DEFAULT) height = hHint + (border * 2); |
| return new Point (width, height); |
| } |
| |
| @Override |
| void createHandle () { |
| super.createHandle(); |
| maybeEnableDarkSystemTheme(); |
| } |
| |
| @Override |
| void createWidget () { |
| super.createWidget (); |
| increment = 1; |
| pageIncrement = 10; |
| /* |
| * Set the initial values of the maximum |
| * to 100 and the thumb to 10. Note that |
| * info.nPage needs to be 11 in order to |
| * get a thumb that is 10. |
| */ |
| SCROLLINFO info = new SCROLLINFO (); |
| info.cbSize = SCROLLINFO.sizeof; |
| info.fMask = OS.SIF_ALL; |
| info.nMax = 100; |
| info.nPage = 11; |
| OS.SetScrollInfo (handle, OS.SB_CTL, info, true); |
| } |
| |
| @Override |
| int defaultBackground () { |
| return OS.GetSysColor (OS.COLOR_SCROLLBAR); |
| } |
| |
| @Override |
| int defaultForeground () { |
| return OS.GetSysColor (OS.COLOR_BTNFACE); |
| } |
| |
| @Override |
| void enableWidget (boolean enabled) { |
| super.enableWidget (enabled); |
| int flags = enabled ? OS.ESB_ENABLE_BOTH : OS.ESB_DISABLE_BOTH; |
| OS.EnableScrollBar (handle, OS.SB_CTL, flags); |
| if (enabled) { |
| state &= ~DISABLED; |
| } else { |
| state |= DISABLED; |
| } |
| } |
| |
| @Override |
| public boolean getEnabled () { |
| checkWidget (); |
| return (state & DISABLED) == 0; |
| } |
| |
| /** |
| * Returns the amount that the receiver's value will be |
| * modified by when the up/down (or right/left) arrows |
| * are pressed. |
| * |
| * @return the increment |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| public int getIncrement () { |
| checkWidget (); |
| return increment; |
| } |
| |
| /** |
| * Returns the maximum value which the receiver will allow. |
| * |
| * @return the maximum |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| public int getMaximum () { |
| checkWidget (); |
| SCROLLINFO info = new SCROLLINFO (); |
| info.cbSize = SCROLLINFO.sizeof; |
| info.fMask = OS.SIF_RANGE; |
| OS.GetScrollInfo (handle, OS.SB_CTL, info); |
| return info.nMax; |
| } |
| |
| /** |
| * Returns the minimum value which the receiver will allow. |
| * |
| * @return the minimum |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| public int getMinimum () { |
| checkWidget (); |
| SCROLLINFO info = new SCROLLINFO (); |
| info.cbSize = SCROLLINFO.sizeof; |
| info.fMask = OS.SIF_RANGE; |
| OS.GetScrollInfo (handle, OS.SB_CTL, info); |
| return info.nMin; |
| } |
| |
| /** |
| * Returns the amount that the receiver's value will be |
| * modified by when the page increment/decrement areas |
| * are selected. |
| * |
| * @return the page increment |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| public int getPageIncrement () { |
| checkWidget (); |
| return pageIncrement; |
| } |
| |
| /** |
| * Returns the 'selection', which is the receiver's value. |
| * |
| * @return the selection |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| public int getSelection () { |
| checkWidget (); |
| SCROLLINFO info = new SCROLLINFO (); |
| info.cbSize = SCROLLINFO.sizeof; |
| info.fMask = OS.SIF_POS; |
| OS.GetScrollInfo (handle, OS.SB_CTL, info); |
| return info.nPos; |
| } |
| |
| /** |
| * Returns the receiver's thumb value. |
| * |
| * @return the thumb value |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| public int getThumb () { |
| checkWidget (); |
| SCROLLINFO info = new SCROLLINFO (); |
| info.cbSize = SCROLLINFO.sizeof; |
| info.fMask = OS.SIF_PAGE; |
| OS.GetScrollInfo (handle, OS.SB_CTL, info); |
| if (info.nPage != 0) --info.nPage; |
| return info.nPage; |
| } |
| |
| /** |
| * Removes the listener from the collection of listeners who will |
| * be notified when the user changes the receiver's value. |
| * |
| * @param listener the listener which should no longer be notified |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the listener is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| * |
| * @see SelectionListener |
| * @see #addSelectionListener |
| */ |
| public void removeSelectionListener (SelectionListener listener) { |
| checkWidget (); |
| if (listener == null) error (SWT.ERROR_NULL_ARGUMENT); |
| if (eventTable == null) return; |
| eventTable.unhook (SWT.Selection, listener); |
| eventTable.unhook (SWT.DefaultSelection,listener); |
| } |
| |
| @Override |
| void setBoundsInPixels (int x, int y, int width, int height, int flags) { |
| super.setBoundsInPixels (x, y, width, height, flags); |
| /* |
| * Bug in Windows. If the scroll bar is resized when it has focus, |
| * the flashing cursor that is used to show that the scroll bar has |
| * focus is not moved. The fix is to send a fake WM_SETFOCUS to |
| * get the scroll bar to recompute the size of the flashing cursor. |
| */ |
| if (OS.GetFocus () == handle) { |
| ignoreFocus = true; |
| OS.SendMessage (handle, OS.WM_SETFOCUS, 0, 0); |
| ignoreFocus = false; |
| } |
| } |
| |
| /** |
| * Sets the amount that the receiver's value will be |
| * modified by when the up/down (or right/left) arrows |
| * are pressed to the argument, which must be at least |
| * one. |
| * |
| * @param value the new increment (must be greater than zero) |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| public void setIncrement (int value) { |
| checkWidget (); |
| if (value < 1) return; |
| increment = value; |
| } |
| |
| /** |
| * Sets the maximum. If this value is negative or less than or |
| * equal to the minimum, the value is ignored. If necessary, first |
| * the thumb and then the selection are adjusted to fit within the |
| * new range. |
| * |
| * @param value the new maximum, which must be greater than the current minimum |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| public void setMaximum (int value) { |
| checkWidget (); |
| if (value < 0) return; |
| SCROLLINFO info = new SCROLLINFO (); |
| info.cbSize = SCROLLINFO.sizeof; |
| info.fMask = OS.SIF_RANGE | OS.SIF_DISABLENOSCROLL; |
| OS.GetScrollInfo (handle, OS.SB_CTL, info); |
| if (value - info.nMin - info.nPage < 1) return; |
| info.nMax = value; |
| SetScrollInfo (handle, OS.SB_CTL, info, true); |
| } |
| |
| /** |
| * Sets the minimum value. If this value is negative or greater |
| * than or equal to the maximum, the value is ignored. If necessary, |
| * first the thumb and then the selection are adjusted to fit within |
| * the new range. |
| * |
| * @param value the new minimum |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| public void setMinimum (int value) { |
| checkWidget (); |
| if (value < 0) return; |
| SCROLLINFO info = new SCROLLINFO (); |
| info.cbSize = SCROLLINFO.sizeof; |
| info.fMask = OS.SIF_RANGE | OS.SIF_DISABLENOSCROLL; |
| OS.GetScrollInfo (handle, OS.SB_CTL, info); |
| if (info.nMax - value - info.nPage < 1) return; |
| info.nMin = value; |
| SetScrollInfo (handle, OS.SB_CTL, info, true); |
| } |
| |
| /** |
| * Sets the amount that the receiver's value will be |
| * modified by when the page increment/decrement areas |
| * are selected to the argument, which must be at least |
| * one. |
| * |
| * @param value the page increment (must be greater than zero) |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| public void setPageIncrement (int value) { |
| checkWidget (); |
| if (value < 1) return; |
| pageIncrement = value; |
| } |
| |
| boolean SetScrollInfo (long hwnd, int flags, SCROLLINFO info, boolean fRedraw) { |
| /* |
| * Feature in Windows. Using SIF_DISABLENOSCROLL, |
| * SetScrollInfo () can change enabled and disabled |
| * state of the scroll bar causing a scroll bar that |
| * was disabled by the application to become enabled. |
| * The fix is to disable the scroll bar (again) when |
| * the application has disabled the scroll bar. |
| */ |
| if ((state & DISABLED) != 0) fRedraw = false; |
| boolean result = OS.SetScrollInfo (hwnd, flags, info, fRedraw); |
| if ((state & DISABLED) != 0) { |
| OS.EnableWindow (handle, false); |
| OS.EnableScrollBar (handle, OS.SB_CTL, OS.ESB_DISABLE_BOTH); |
| } |
| |
| /* |
| * Bug in Windows. If the thumb is resized when it has focus, |
| * the flashing cursor that is used to show that the scroll bar |
| * has focus is not moved. The fix is to send a fake WM_SETFOCUS |
| * to get the scroll bar to recompute the size of the flashing |
| * cursor. |
| */ |
| if (OS.GetFocus () == handle) { |
| ignoreFocus = true; |
| OS.SendMessage (handle, OS.WM_SETFOCUS, 0, 0); |
| ignoreFocus = false; |
| } |
| return result; |
| } |
| |
| /** |
| * Sets the 'selection', which is the receiver's |
| * value, to the argument which must be greater than or equal |
| * to zero. |
| * |
| * @param value the new selection (must be zero or greater) |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| public void setSelection (int value) { |
| checkWidget (); |
| SCROLLINFO info = new SCROLLINFO (); |
| info.cbSize = SCROLLINFO.sizeof; |
| info.fMask = OS.SIF_POS; |
| info.nPos = value; |
| SetScrollInfo (handle, OS.SB_CTL, info, true); |
| } |
| |
| /** |
| * Sets the thumb value. The thumb value should be used to represent |
| * the size of the visual portion of the current range. This value is |
| * usually the same as the page increment value. |
| * <p> |
| * This new value will be ignored if it is less than one, and will be |
| * clamped if it exceeds the receiver's current range. |
| * </p> |
| * |
| * @param value the new thumb value, which must be at least one and not |
| * larger than the size of the current range |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| public void setThumb (int value) { |
| checkWidget (); |
| if (value < 1) return; |
| SCROLLINFO info = new SCROLLINFO (); |
| info.cbSize = SCROLLINFO.sizeof; |
| info.fMask = OS.SIF_PAGE | OS.SIF_RANGE | OS.SIF_DISABLENOSCROLL; |
| OS.GetScrollInfo (handle, OS.SB_CTL, info); |
| info.nPage = value; |
| if (info.nPage != 0) info.nPage++; |
| SetScrollInfo (handle, OS.SB_CTL, info, true); |
| } |
| |
| /** |
| * Sets the receiver's selection, minimum value, maximum |
| * value, thumb, increment and page increment all at once. |
| * <p> |
| * Note: This is similar to setting the values individually |
| * using the appropriate methods, but may be implemented in a |
| * more efficient fashion on some platforms. |
| * </p> |
| * |
| * @param selection the new selection value |
| * @param minimum the new minimum value |
| * @param maximum the new maximum value |
| * @param thumb the new thumb value |
| * @param increment the new increment value |
| * @param pageIncrement the new pageIncrement value |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| public void setValues (int selection, int minimum, int maximum, int thumb, int increment, int pageIncrement) { |
| checkWidget (); |
| if (minimum < 0) return; |
| if (maximum < 0) return; |
| if (thumb < 1) return; |
| if (increment < 1) return; |
| if (pageIncrement < 1) return; |
| this.increment = increment; |
| this.pageIncrement = pageIncrement; |
| SCROLLINFO info = new SCROLLINFO (); |
| info.cbSize = SCROLLINFO.sizeof; |
| info.fMask = OS.SIF_POS | OS.SIF_PAGE | OS.SIF_RANGE | OS.SIF_DISABLENOSCROLL; |
| info.nPos = selection; |
| info.nMin = minimum; |
| info.nMax = maximum; |
| info.nPage = thumb; |
| if (info.nPage != 0) info.nPage++; |
| SetScrollInfo (handle, OS.SB_CTL, info, true); |
| } |
| |
| @Override |
| int widgetExtStyle () { |
| /* |
| * Bug in Windows. If a scroll bar control is given a border, |
| * dragging the scroll bar thumb eats away parts of the border |
| * while the thumb is dragged. The fix is to clear border for |
| * all scroll bars. |
| */ |
| int bits = super.widgetExtStyle (); |
| if ((style & SWT.BORDER) != 0) bits &= ~OS.WS_EX_CLIENTEDGE; |
| return bits; |
| } |
| |
| @Override |
| int widgetStyle () { |
| int bits = super.widgetStyle () | OS.WS_TABSTOP; |
| /* |
| * Bug in Windows. If a scroll bar control is given a border, |
| * dragging the scroll bar thumb eats away parts of the border |
| * while the thumb is dragged. The fix is to clear WS_BORDER. |
| */ |
| if ((style & SWT.BORDER) != 0) bits &= ~OS.WS_BORDER; |
| if ((style & SWT.HORIZONTAL) != 0) return bits | OS.SBS_HORZ; |
| return bits | OS.SBS_VERT; |
| } |
| |
| @Override |
| TCHAR windowClass () { |
| return ScrollBarClass; |
| } |
| |
| @Override |
| long windowProc () { |
| return ScrollBarProc; |
| } |
| |
| @Override |
| LRESULT WM_KEYDOWN (long wParam, long lParam) { |
| LRESULT result = super.WM_KEYDOWN (wParam, lParam); |
| if (result != null) return result; |
| if ((style & SWT.VERTICAL) != 0) return result; |
| /* |
| * Bug in Windows. When a horizontal scroll bar is mirrored, |
| * the native control does not correctly swap the arrow keys. |
| * The fix is to swap them before calling the scroll bar window |
| * proc. |
| * |
| * NOTE: This fix is not ideal. It breaks when the bug is fixed |
| * in the operating system. |
| */ |
| if ((style & SWT.MIRRORED) != 0) { |
| switch ((int)wParam) { |
| case OS.VK_LEFT: |
| case OS.VK_RIGHT: { |
| int key = wParam == OS.VK_LEFT ? OS.VK_RIGHT : OS.VK_LEFT; |
| long code = callWindowProc (handle, OS.WM_KEYDOWN, key, lParam); |
| return new LRESULT (code); |
| } |
| } |
| } |
| return result; |
| } |
| |
| @Override |
| LRESULT WM_LBUTTONDBLCLK (long wParam, long lParam) { |
| /* |
| * Feature in Windows. Windows uses the WS_TABSTOP |
| * style for the scroll bar to decide that focus |
| * should be set during WM_LBUTTONDBLCLK. This is |
| * not the desired behavior. The fix is to clear |
| * and restore WS_TABSTOP so that Windows will not |
| * assign focus. |
| */ |
| int oldBits = OS.GetWindowLong (handle, OS.GWL_STYLE); |
| int newBits = oldBits & ~OS.WS_TABSTOP; |
| OS.SetWindowLong (handle, OS.GWL_STYLE, newBits); |
| LRESULT result = super.WM_LBUTTONDBLCLK (wParam, lParam); |
| if (isDisposed ()) return LRESULT.ZERO; |
| OS.SetWindowLong (handle, OS.GWL_STYLE, oldBits); |
| if (result == LRESULT.ZERO) return result; |
| |
| /* |
| * Feature in Windows. Windows runs a modal message loop |
| * when the user drags a scroll bar that terminates when |
| * it sees an WM_LBUTTONUP. Unfortunately the WM_LBUTTONUP |
| * is consumed. The fix is to send a fake mouse up and |
| * release the automatic capture. |
| */ |
| if (OS.GetCapture () == handle) OS.ReleaseCapture (); |
| if (!sendMouseEvent (SWT.MouseUp, 1, handle, lParam)) { |
| return LRESULT.ZERO; |
| } |
| return result; |
| } |
| |
| @Override |
| LRESULT WM_LBUTTONDOWN (long wParam, long lParam) { |
| /* |
| * Feature in Windows. Windows uses the WS_TABSTOP |
| * style for the scroll bar to decide that focus |
| * should be set during WM_LBUTTONDOWN. This is |
| * not the desired behavior. The fix is to clear |
| * and restore WS_TABSTOP so that Windows will not |
| * assign focus. |
| */ |
| int oldBits = OS.GetWindowLong (handle, OS.GWL_STYLE); |
| int newBits = oldBits & ~OS.WS_TABSTOP; |
| OS.SetWindowLong (handle, OS.GWL_STYLE, newBits); |
| LRESULT result = super.WM_LBUTTONDOWN (wParam, lParam); |
| if (isDisposed ()) return LRESULT.ZERO; |
| OS.SetWindowLong (handle, OS.GWL_STYLE, oldBits); |
| if (result == LRESULT.ZERO) return result; |
| |
| /* |
| * Feature in Windows. Windows runs a modal message loop |
| * when the user drags a scroll bar that terminates when |
| * it sees an WM_LBUTTONUP. Unfortunately the WM_LBUTTONUP |
| * is consumed. The fix is to send a fake mouse up and |
| * release the automatic capture. |
| */ |
| if (OS.GetCapture () == handle) OS.ReleaseCapture (); |
| if (!sendMouseEvent (SWT.MouseUp, 1, handle, lParam)) { |
| return LRESULT.ONE; |
| } |
| return result; |
| } |
| |
| @Override |
| LRESULT WM_SETFOCUS (long wParam, long lParam) { |
| if (ignoreFocus) return null; |
| return super.WM_SETFOCUS (wParam, lParam); |
| } |
| |
| @Override |
| LRESULT wmScrollChild (long wParam, long lParam) { |
| |
| /* Do nothing when scrolling is ending */ |
| int code = OS.LOWORD (wParam); |
| if (code == OS.SB_ENDSCROLL) return null; |
| |
| /* Move the thumb */ |
| Event event = new Event (); |
| SCROLLINFO info = new SCROLLINFO (); |
| info.cbSize = SCROLLINFO.sizeof; |
| info.fMask = OS.SIF_TRACKPOS | OS.SIF_POS | OS.SIF_RANGE; |
| OS.GetScrollInfo (handle, OS.SB_CTL, info); |
| info.fMask = OS.SIF_POS; |
| switch (code) { |
| case OS.SB_THUMBPOSITION: |
| event.detail = SWT.NONE; |
| info.nPos = info.nTrackPos; |
| break; |
| case OS.SB_THUMBTRACK: |
| event.detail = SWT.DRAG; |
| info.nPos = info.nTrackPos; |
| break; |
| case OS.SB_TOP: |
| event.detail = SWT.HOME; |
| info.nPos = info.nMin; |
| break; |
| case OS.SB_BOTTOM: |
| event.detail = SWT.END; |
| info.nPos = info.nMax; |
| break; |
| case OS.SB_LINEDOWN: |
| event.detail = SWT.ARROW_DOWN; |
| info.nPos += increment; |
| break; |
| case OS.SB_LINEUP: |
| event.detail = SWT.ARROW_UP; |
| info.nPos = Math.max (info.nMin, info.nPos - increment); |
| break; |
| case OS.SB_PAGEDOWN: |
| event.detail = SWT.PAGE_DOWN; |
| info.nPos += pageIncrement; |
| break; |
| case OS.SB_PAGEUP: |
| event.detail = SWT.PAGE_UP; |
| info.nPos = Math.max (info.nMin, info.nPos - pageIncrement); |
| break; |
| } |
| OS.SetScrollInfo (handle, OS.SB_CTL, info, true); |
| |
| /* |
| * Feature in Windows. Windows runs a modal message |
| * loop when the user drags a scroll bar. This means |
| * that selection event must be sent because WM_HSCROLL |
| * and WM_VSCROLL are sent from the modal message loop |
| * so that they are delivered during inside the loop. |
| */ |
| sendSelectionEvent (SWT.Selection, event, true); |
| // the widget could be destroyed at this point |
| return null; |
| } |
| |
| } |