Java tutorial
/******************************************************************************* * 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.internal.*; import org.eclipse.swt.internal.win32.*; import org.eclipse.swt.*; import org.eclipse.swt.graphics.*; /** * Instances of this class allow the user to select a color * from a predefined set of available colors. * <dl> * <dt><b>Styles:</b></dt> * <dd>(none)</dd> * <dt><b>Events:</b></dt> * <dd>(none)</dd> * </dl> * <p> * IMPORTANT: This class is <em>not</em> intended to be subclassed. * </p> * * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: ControlExample, Dialog tab</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 ColorDialog extends Dialog { static final int CUSTOM_COLOR_COUNT = 16; // from the MS spec for CHOOSECOLOR.lpCustColors Display display; int width, height; RGB rgb; RGB[] rgbs; int[] colors = new int[CUSTOM_COLOR_COUNT]; /** * Constructs a new instance of this class given only its parent. * * @param parent a composite control which will be the parent of the new instance * * @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 * @see Widget#checkSubclass * @see Widget#getStyle */ public ColorDialog(Shell parent) { this(parent, SWT.APPLICATION_MODAL); } /** * 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 * @see Widget#checkSubclass * @see Widget#getStyle */ public ColorDialog(Shell parent, int style) { super(parent, checkStyle(parent, style)); checkSubclass(); } long CCHookProc(long hdlg, long uiMsg, long lParam, long lpData) { switch ((int) uiMsg) { case OS.WM_INITDIALOG: { RECT rect = new RECT(); OS.GetWindowRect(hdlg, rect); width = rect.right - rect.left; height = rect.bottom - rect.top; if (title != null && title.length() != 0) { /* Use the character encoding for the default locale */ TCHAR buffer = new TCHAR(0, title, true); OS.SetWindowText(hdlg, buffer); } break; } case OS.WM_DESTROY: { RECT rect = new RECT(); OS.GetWindowRect(hdlg, rect); int newWidth = rect.right - rect.left; int newHeight = rect.bottom - rect.top; if (newWidth < width || newHeight < height) { //display.fullOpen = false; } else { if (newWidth > width || newHeight > height) { //display.fullOpen = true; } } break; } } return 0; } /** * Returns the currently selected color in the receiver. * * @return the RGB value for the selected color, may be null * * @see PaletteData#getRGBs */ public RGB getRGB() { return rgb; } /** * Returns an array of <code>RGB</code>s which are the list of * custom colors selected by the user in the receiver, or null * if no custom colors were selected. * * @return the array of RGBs, which may be null * * @since 3.8 */ public RGB[] getRGBs() { return rgbs; } /** * Makes the receiver visible and brings it to the front * of the display. * * @return the selected color, or null if the dialog was * cancelled, no color was selected, or an error * occurred * * @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 RGB open() { /* Get the owner HWND for the dialog */ long hwndOwner = parent.handle; long hwndParent = parent.handle; /* * Feature in Windows. There is no API to set the orientation of a * color dialog. It is always inherited from the parent. The fix is * to create a hidden parent and set the orientation in the hidden * parent for the dialog to inherit. */ boolean enabled = false; int dialogOrientation = style & (SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT); int parentOrientation = parent.style & (SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT); if (dialogOrientation != parentOrientation) { int exStyle = OS.WS_EX_NOINHERITLAYOUT; if (dialogOrientation == SWT.RIGHT_TO_LEFT) exStyle |= OS.WS_EX_LAYOUTRTL; hwndOwner = OS.CreateWindowEx(exStyle, Shell.DialogClass, null, 0, OS.CW_USEDEFAULT, 0, OS.CW_USEDEFAULT, 0, hwndParent, 0, OS.GetModuleHandle(null), null); enabled = OS.IsWindowEnabled(hwndParent); if (enabled) OS.EnableWindow(hwndParent, false); } /* Create the CCHookProc */ Callback callback = new Callback(this, "CCHookProc", 4); //$NON-NLS-1$ long lpfnHook = callback.getAddress(); if (lpfnHook == 0) error(SWT.ERROR_NO_MORE_CALLBACKS); /* Allocate the Custom Colors and initialize to white */ display = parent.display; if (display.lpCustColors == 0) { long hHeap = OS.GetProcessHeap(); display.lpCustColors = OS.HeapAlloc(hHeap, OS.HEAP_ZERO_MEMORY, CUSTOM_COLOR_COUNT * 4); for (int i = 0; i < CUSTOM_COLOR_COUNT; i++) { colors[i] = 0x00FFFFFF; } OS.MoveMemory(display.lpCustColors, colors, CUSTOM_COLOR_COUNT * 4); } /* Set the Custom Colors (if any) into the dialog */ if (rgbs != null) { int length = rgbs.length > CUSTOM_COLOR_COUNT ? CUSTOM_COLOR_COUNT : rgbs.length; for (int i = 0; i < length; i++) { RGB rgb = rgbs[i]; int red = rgb.red & 0xFF; int green = (rgb.green << 8) & 0xFF00; int blue = (rgb.blue << 16) & 0xFF0000; colors[i] = red | green | blue; } for (int i = length; i < CUSTOM_COLOR_COUNT; i++) { colors[i] = 0x00FFFFFF; } OS.MoveMemory(display.lpCustColors, colors, CUSTOM_COLOR_COUNT * 4); } /* Open the dialog */ CHOOSECOLOR lpcc = new CHOOSECOLOR(); lpcc.lStructSize = CHOOSECOLOR.sizeof; lpcc.Flags = OS.CC_ANYCOLOR | OS.CC_ENABLEHOOK; //if (display.fullOpen) lpcc.Flags |= OS.CC_FULLOPEN; lpcc.lpfnHook = lpfnHook; lpcc.hwndOwner = hwndOwner; lpcc.lpCustColors = display.lpCustColors; if (rgb != null) { lpcc.Flags |= OS.CC_RGBINIT; int red = rgb.red & 0xFF; int green = (rgb.green << 8) & 0xFF00; int blue = (rgb.blue << 16) & 0xFF0000; lpcc.rgbResult = red | green | blue; } /* Make the parent shell be temporary modal */ Dialog oldModal = null; if ((style & (SWT.APPLICATION_MODAL | SWT.SYSTEM_MODAL)) != 0) { oldModal = display.getModalDialog(); display.setModalDialog(this); } display.sendPreExternalEventDispatchEvent(); /* Open the dialog */ boolean success = OS.ChooseColor(lpcc); display.sendPostExternalEventDispatchEvent(); /* Clear the temporary dialog modal parent */ if ((style & (SWT.APPLICATION_MODAL | SWT.SYSTEM_MODAL)) != 0) { display.setModalDialog(oldModal); } /* Get the Custom Colors (if the user defined any) from the dialog */ boolean customColor = false; OS.MoveMemory(colors, display.lpCustColors, colors.length * 4); for (int i = 0; i < colors.length; i++) { if (colors[i] != 0x00FFFFFF) { customColor = true; break; } } if (customColor) { rgbs = new RGB[CUSTOM_COLOR_COUNT]; for (int i = 0; i < colors.length; i++) { int color = colors[i]; int red = color & 0xFF; int green = (color >> 8) & 0xFF; int blue = (color >> 16) & 0xFF; rgbs[i] = new RGB(red, green, blue); } } if (success) { int red = lpcc.rgbResult & 0xFF; int green = (lpcc.rgbResult >> 8) & 0xFF; int blue = (lpcc.rgbResult >> 16) & 0xFF; rgb = new RGB(red, green, blue); } /* Free the CCHookProc */ callback.dispose(); /* Free the Custom Colors */ /* * This code is intentionally commented. Currently, * there is exactly one set of custom colors per display. * The memory associated with these colors is released * when the display is disposed. */ // if (lpCustColors != 0) OS.HeapFree (hHeap, 0, lpCustColors); /* Destroy the BIDI orientation window */ if (hwndParent != hwndOwner) { if (enabled) OS.EnableWindow(hwndParent, true); OS.SetActiveWindow(hwndParent); OS.DestroyWindow(hwndOwner); } /* * This code is intentionally commented. On some * platforms, the owner window is repainted right * away when a dialog window exits. This behavior * is currently unspecified. */ // if (hwndOwner != 0) OS.UpdateWindow (hwndOwner); display = null; if (!success) return null; return rgb; } /** * Sets the receiver's selected color to be the argument. * * @param rgb the new RGB value for the selected color, may be * null to let the platform select a default when * open() is called * @see PaletteData#getRGBs */ public void setRGB(RGB rgb) { this.rgb = rgb; } /** * Sets the receiver's list of custom colors to be the given array * of <code>RGB</code>s, which may be null to let the platform select * a default when open() is called. * * @param rgbs the array of RGBs, which may be null * * @exception IllegalArgumentException <ul> * <li>ERROR_INVALID_ARGUMENT - if an RGB in the rgbs array is null</li> * </ul> * * @since 3.8 */ public void setRGBs(RGB[] rgbs) { if (rgbs != null) { for (int i = 0; i < rgbs.length; i++) { if (rgbs[i] == null) error(SWT.ERROR_INVALID_ARGUMENT); } } this.rgbs = rgbs; } }