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package org.eclipse.swt.widgets;
/*
* (c) Copyright IBM Corp. 2000, 2001.
* All Rights Reserved
*/
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 intended to be subclassed <em>only</em>
* within the SWT implementation.
* </p>
*/
public class ColorDialog extends Dialog {
RGB rgb;
/**
* 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 (cannot be null)
*
* @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.NULL);
}
/**
* 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
* for all SWT widget classes should include a comment which
* describes the style constants which are applicable to the class.
* </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, style);
}
int CCHookProc (int hdlg, int uiMsg, int lParam, int lpData) {
switch (uiMsg) {
case OS.WM_INITDIALOG:
if (title != null && title.length () != 0) {
byte [] buffer = Converter.wcsToMbcs (0, title, true);
OS.SetWindowText (hdlg, buffer);
}
break;
}
return 0;
}
/**
* Returns the currently selected color in the receiver.
*
* @return the RGB value for the selected color
*
* @see PaletteData#getRGBs
*/
public RGB getRGB () {
return rgb;
}
/**
* Makes the receiver visible and brings it to the front
* of the display.
*
* @return the selected color
*
* @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 */
int hwndOwner = 0;
if (parent != null) hwndOwner = parent.handle;
/* Create the CCHookProc */
Callback callback = new Callback (this, "CCHookProc", 4);
int lpfnHook = callback.getAddress ();
/* Open the dialog */
int hHeap = OS.GetProcessHeap ();
int lpCustColors = OS.HeapAlloc (hHeap, OS.HEAP_ZERO_MEMORY, 16 * 4);
CHOOSECOLOR lpcc = new CHOOSECOLOR ();
lpcc.lStructSize = CHOOSECOLOR.sizeof;
lpcc.Flags = OS.CC_ANYCOLOR | OS.CC_ENABLEHOOK;
lpcc.lpfnHook = lpfnHook;
lpcc.hwndOwner = hwndOwner;
lpcc.lpCustColors = 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;
}
rgb = null;
if (OS.ChooseColor (lpcc)) {
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 OS memory */
if (lpCustColors != 0) OS.HeapFree (hHeap, 0, lpCustColors);
/*
* 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);
return rgb;
}
/**
* Returns the receiver's selected color to be the argument.
*
* @param rgb the new RGB value for the selected color
*
* @see PaletteData#getRGBs
*/
public void setRGB (RGB rgb) {
this.rgb = rgb;
}
}
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