| /******************************************************************************* |
| * Copyright (c) 2000, 2005 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.swt.widgets; |
| |
| |
| import org.eclipse.swt.internal.win32.*; |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.events.*; |
| |
| /** |
| * Instances of the receiver represent a selectable user |
| * interface object that present a range of continuous |
| * numeric values. |
| * <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> |
| * <p> |
| * IMPORTANT: This class is intended to be subclassed <em>only</em> |
| * within the SWT implementation. |
| * </p> |
| */ |
| |
| public class Scale extends Control { |
| static final int TrackBarProc; |
| static final TCHAR TrackBarClass = new TCHAR (0, OS.TRACKBAR_CLASS, true); |
| static { |
| WNDCLASS lpWndClass = new WNDCLASS (); |
| OS.GetClassInfo (0, TrackBarClass, lpWndClass); |
| TrackBarProc = lpWndClass.lpfnWndProc; |
| /* |
| * Feature in Windows. The track bar window class |
| * does not include CS_DBLCLKS. This mean that these |
| * controls will not get double click messages such as |
| * WM_LBUTTONDBLCLK. The fix is to register a new |
| * window class with CS_DBLCLKS. |
| * |
| * NOTE: Screen readers look for the exact class name |
| * of the control in order to provide the correct kind |
| * of assistance. Therefore, it is critical that the |
| * new window class have the same name. It is possible |
| * to register a local window class with the same name |
| * as a global class. Since bits that affect the class |
| * are being changed, it is possible that other native |
| * code, other than SWT, could create a control with |
| * this class name, and fail unexpectedly. |
| */ |
| int hInstance = OS.GetModuleHandle (null); |
| int hHeap = OS.GetProcessHeap (); |
| lpWndClass.hInstance = hInstance; |
| lpWndClass.style &= ~OS.CS_GLOBALCLASS; |
| lpWndClass.style |= OS.CS_DBLCLKS; |
| int byteCount = TrackBarClass.length () * TCHAR.sizeof; |
| int lpszClassName = OS.HeapAlloc (hHeap, OS.HEAP_ZERO_MEMORY, byteCount); |
| OS.MoveMemory (lpszClassName, TrackBarClass, byteCount); |
| lpWndClass.lpszClassName = lpszClassName; |
| OS.RegisterClass (lpWndClass); |
| // OS.HeapFree (hHeap, 0, lpszClassName); |
| } |
| |
| /** |
| * 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 Scale (Composite parent, int style) { |
| super (parent, checkStyle (style)); |
| } |
| |
| /** |
| * Adds the listener to the collection of listeners who will |
| * be notified when the receiver's value changes, by sending |
| * it one of the messages defined in the <code>SelectionListener</code> |
| * interface. |
| * |
| * @param listener the listener which should 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 #removeSelectionListener |
| */ |
| 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); |
| } |
| |
| int callWindowProc (int hwnd, int msg, int wParam, int lParam) { |
| if (handle == 0) return 0; |
| return OS.CallWindowProc (TrackBarProc, hwnd, msg, wParam, lParam); |
| } |
| |
| static int checkStyle (int style) { |
| return checkBits (style, SWT.HORIZONTAL, SWT.VERTICAL, 0, 0, 0, 0); |
| } |
| |
| public Point computeSize (int wHint, int hHint, boolean changed) { |
| checkWidget (); |
| int border = getBorderWidth (); |
| int width = border * 2, height = border * 2; |
| RECT rect = new RECT (); |
| OS.SendMessage (handle, OS.TBM_GETTHUMBRECT, 0, rect); |
| if ((style & SWT.HORIZONTAL) != 0) { |
| width += OS.GetSystemMetrics (OS.SM_CXHSCROLL) * 10; |
| int scrollY = OS.GetSystemMetrics (OS.SM_CYHSCROLL); |
| height += (rect.top * 2) + scrollY + (scrollY / 3); |
| } else { |
| int scrollX = OS.GetSystemMetrics (OS.SM_CXVSCROLL); |
| width += (rect.left * 2) + scrollX + (scrollX / 3); |
| 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); |
| } |
| |
| void createHandle () { |
| super.createHandle (); |
| OS.SendMessage (handle, OS.TBM_SETRANGEMAX, 0, 100); |
| OS.SendMessage (handle, OS.TBM_SETPAGESIZE, 0, 10); |
| OS.SendMessage (handle, OS.TBM_SETTICFREQ, 10, 0); |
| } |
| |
| int defaultForeground () { |
| return OS.GetSysColor (OS.COLOR_BTNFACE); |
| } |
| |
| /** |
| * 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 OS.SendMessage (handle, OS.TBM_GETLINESIZE, 0, 0); |
| } |
| |
| /** |
| * 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 (); |
| return OS.SendMessage (handle, OS.TBM_GETRANGEMAX, 0, 0); |
| } |
| |
| /** |
| * 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 (); |
| return OS.SendMessage (handle, OS.TBM_GETRANGEMIN, 0, 0); |
| } |
| |
| /** |
| * 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 OS.SendMessage (handle, OS.TBM_GETPAGESIZE, 0, 0); |
| } |
| |
| /** |
| * Returns the 'selection', which is the receiver's position. |
| * |
| * @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 (); |
| return OS.SendMessage (handle, OS.TBM_GETPOS, 0, 0); |
| } |
| |
| /** |
| * Removes the listener from the collection of listeners who will |
| * be notified when the receiver's value changes. |
| * |
| * @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); |
| } |
| |
| void setBackgroundPixel (int pixel) { |
| if (background == pixel) return; |
| super.setBackgroundPixel (pixel); |
| /* |
| * Bug in Windows. Changing the background color of the Scale |
| * widget and calling InvalidateRect() still draws with the old |
| * color. The fix is to post a fake WM_SETFOCUS event to cause |
| * it to redraw with the new background color. |
| * |
| * Note. This WM_SETFOCUS message causes recursion when |
| * setBackground is called from within the focus event |
| * listener. |
| */ |
| OS.PostMessage (handle, OS.WM_SETFOCUS, 0, 0); |
| } |
| |
| /** |
| * 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 increment 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 increment) { |
| checkWidget (); |
| if (increment < 1) return; |
| int minimum = OS.SendMessage (handle, OS.TBM_GETRANGEMIN, 0, 0); |
| int maximum = OS.SendMessage (handle, OS.TBM_GETRANGEMAX, 0, 0); |
| if (increment > maximum - minimum) return; |
| OS.SendMessage (handle, OS.TBM_SETLINESIZE, 0, increment); |
| } |
| |
| /** |
| * Sets the maximum value that the receiver will allow. This new |
| * value will be ignored if it is not greater than the receiver's current |
| * minimum value. If the new maximum is applied then the receiver's |
| * selection value will be adjusted if necessary to fall within its 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 (); |
| int minimum = OS.SendMessage (handle, OS.TBM_GETRANGEMIN, 0, 0); |
| if (0 <= minimum && minimum < value) { |
| OS.SendMessage (handle, OS.TBM_SETRANGEMAX, 1, value); |
| } |
| } |
| |
| /** |
| * Sets the minimum value that the receiver will allow. This new |
| * value will be ignored if it is negative or is not less than the receiver's |
| * current maximum value. If the new minimum is applied then the receiver's |
| * selection value will be adjusted if necessary to fall within its new range. |
| * |
| * @param value the new minimum, which must be nonnegative and less than the current 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 void setMinimum (int value) { |
| checkWidget (); |
| int maximum = OS.SendMessage (handle, OS.TBM_GETRANGEMAX, 0, 0); |
| if (0 <= value && value < maximum) { |
| OS.SendMessage (handle, OS.TBM_SETRANGEMIN, 1, value); |
| } |
| } |
| |
| /** |
| * 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 pageIncrement 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 pageIncrement) { |
| checkWidget (); |
| if (pageIncrement < 1) return; |
| int minimum = OS.SendMessage (handle, OS.TBM_GETRANGEMIN, 0, 0); |
| int maximum = OS.SendMessage (handle, OS.TBM_GETRANGEMAX, 0, 0); |
| if (pageIncrement > maximum - minimum) return; |
| OS.SendMessage (handle, OS.TBM_SETPAGESIZE, 0, pageIncrement); |
| OS.SendMessage (handle, OS.TBM_SETTICFREQ, pageIncrement, 0); |
| } |
| |
| /** |
| * 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 (); |
| OS.SendMessage (handle, OS.TBM_SETPOS, 1, value); |
| } |
| |
| int widgetStyle () { |
| int bits = super.widgetStyle () | OS.WS_TABSTOP | OS.TBS_BOTH | OS.TBS_AUTOTICKS; |
| if ((style & SWT.HORIZONTAL) != 0) return bits | OS.TBS_HORZ | OS.TBS_DOWNISLEFT; |
| return bits | OS.TBS_VERT; |
| } |
| |
| TCHAR windowClass () { |
| return TrackBarClass; |
| } |
| |
| int windowProc () { |
| return TrackBarProc; |
| } |
| |
| LRESULT wmScrollChild (int wParam, int lParam) { |
| |
| /* Do nothing when scrolling is ending */ |
| int code = wParam & 0xFFFF; |
| switch (code) { |
| case OS.TB_ENDTRACK: |
| case OS.TB_THUMBPOSITION: |
| return null; |
| } |
| |
| Event event = new Event (); |
| /* |
| * This code is intentionally commented. The event |
| * detail field is not currently supported on all |
| * platforms. |
| */ |
| // switch (code) { |
| // case OS.TB_TOP: event.detail = SWT.HOME; break; |
| // case OS.TB_BOTTOM: event.detail = SWT.END; break; |
| // case OS.TB_LINEDOWN: event.detail = SWT.ARROW_DOWN; break; |
| // case OS.TB_LINEUP: event.detail = SWT.ARROW_UP; break; |
| // case OS.TB_PAGEDOWN: event.detail = SWT.PAGE_DOWN; break; |
| // case OS.TB_PAGEUP: event.detail = SWT.PAGE_UP; break; |
| // } |
| |
| /* |
| * Send the event because WM_HSCROLL and WM_VSCROLL |
| * are sent from a modal message loop in windows that |
| * is active when the user is scrolling. |
| */ |
| sendEvent (SWT.Selection, event); |
| // widget could be disposed at this point |
| return null; |
| } |
| |
| } |