/src/org/eclipse/swt/graphics/Color.d
D | 339 lines | 111 code | 24 blank | 204 comment | 24 complexity | d48f91c0cf26b9367172250621c02811 MD5 | raw file
- /*******************************************************************************
- * Copyright (c) 2000, 2008 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
- * Port to the D programming language:
- * Frank Benoit <benoit@tionex.de>
- *******************************************************************************/
- module org.eclipse.swt.graphics.Color;
- import org.eclipse.swt.SWT;
- import org.eclipse.swt.SWTException;
- import org.eclipse.swt.internal.win32.OS;
- import org.eclipse.swt.graphics.Resource;
- import org.eclipse.swt.graphics.RGB;
- import org.eclipse.swt.graphics.Device;
- import java.lang.all;
- /**
- * Instances of this class manage the operating system resources that
- * implement SWT's RGB color model. To create a color you can either
- * specify the individual color components as integers in the range
- * 0 to 255 or provide an instance of an <code>RGB</code>.
- * <p>
- * Application code must explicitly invoke the <code>Color.dispose()</code>
- * method to release the operating system resources managed by each instance
- * when those instances are no longer required.
- * </p>
- *
- * @see RGB
- * @see Device#getSystemColor
- * @see <a href="http://www.eclipse.org/swt/snippets/#color">Color and RGB snippets</a>
- * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: PaintExample</a>
- * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
- */
- public final class Color : Resource {
- alias Resource.init_ init_;
- /**
- * the handle to the OS color resource
- * (Warning: This field is platform dependent)
- * <p>
- * <b>IMPORTANT:</b> This field is <em>not</em> part of the SWT
- * public API. It is marked public only so that it can be shared
- * within the packages provided by SWT. It is not available on all
- * platforms and should never be accessed from application code.
- * </p>
- */
- public COLORREF handle;
- /**
- * Prevents uninitialized instances from being created outside the package.
- */
- this(Device device) {
- super(device);
- }
- /**
- * Constructs a new instance of this class given a device and the
- * desired red, green and blue values expressed as ints in the range
- * 0 to 255 (where 0 is black and 255 is full brightness). On limited
- * color devices, the color instance created by this call may not have
- * the same RGB values as the ones specified by the arguments. The
- * RGB values on the returned instance will be the color values of
- * the operating system color.
- * <p>
- * You must dispose the color when it is no longer required.
- * </p>
- *
- * @param device the device on which to allocate the color
- * @param red the amount of red in the color
- * @param green the amount of green in the color
- * @param blue the amount of blue in the color
- *
- * @exception IllegalArgumentException <ul>
- * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
- * <li>ERROR_INVALID_ARGUMENT - if the red, green or blue argument is not between 0 and 255</li>
- * </ul>
- *
- * @see #dispose
- */
- public this (Device device, int red, int green, int blue) {
- super(device);
- init_(red, green, blue);
- init_();
- }
- /**
- * Constructs a new instance of this class given a device and an
- * <code>RGB</code> describing the desired red, green and blue values.
- * On limited color devices, the color instance created by this call
- * may not have the same RGB values as the ones specified by the
- * argument. The RGB values on the returned instance will be the color
- * values of the operating system color.
- * <p>
- * You must dispose the color when it is no longer required.
- * </p>
- *
- * @param device the device on which to allocate the color
- * @param rgb the RGB values of the desired color
- *
- * @exception IllegalArgumentException <ul>
- * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
- * <li>ERROR_NULL_ARGUMENT - if the rgb argument is null</li>
- * <li>ERROR_INVALID_ARGUMENT - if the red, green or blue components of the argument are not between 0 and 255</li>
- * </ul>
- *
- * @see #dispose
- */
- public this (Device device, constRGB rgb) {
- super(device);
- if (rgb is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
- init_(rgb.red, rgb.green, rgb.blue);
- init_();
- }
- void destroy() {
- /*
- * If this is a palette-based device,
- * Decrease the reference count for this color.
- * If the reference count reaches 0, the slot may
- * be reused when another color is allocated.
- */
- auto hPal = device.hPalette;
- if (hPal !is null) {
- int index = OS.GetNearestPaletteIndex(hPal, handle);
- int[] colorRefCount = device.colorRefCount;
- if (colorRefCount[index] > 0) {
- colorRefCount[index]--;
- }
- }
- handle = -1;
- }
- /**
- * Compares the argument to the receiver, and returns true
- * if they represent the <em>same</em> object using a class
- * specific comparison.
- *
- * @param object the object to compare with this object
- * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
- *
- * @see #hashCode
- */
- public override equals_t opEquals (Object object) {
- if (object is this) return true;
- if (!(cast(Color)object)) return false;
- Color color = cast(Color) object;
- return device is color.device && (handle & 0xFFFFFF) is (color.handle & 0xFFFFFF);
- }
- /**
- * Returns the amount of blue in the color, from 0 to 255.
- *
- * @return the blue component of the color
- *
- * @exception SWTException <ul>
- * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
- * </ul>
- */
- public int getBlue () {
- if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
- return (handle & 0xFF0000) >> 16;
- }
- /**
- * Returns the amount of green in the color, from 0 to 255.
- *
- * @return the green component of the color
- *
- * @exception SWTException <ul>
- * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
- * </ul>
- */
- public int getGreen () {
- if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
- return (handle & 0xFF00) >> 8 ;
- }
- /**
- * Returns the amount of red in the color, from 0 to 255.
- *
- * @return the red component of the color
- *
- * @exception SWTException <ul>
- * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
- * </ul>
- */
- public int getRed () {
- if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
- return handle & 0xFF;
- }
- /**
- * Returns an <code>RGB</code> representing the receiver.
- *
- * @return the RGB for the color
- *
- * @exception SWTException <ul>
- * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
- * </ul>
- */
- public RGB getRGB () {
- if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
- return new RGB(cast(int)handle & 0xFF,cast(int) (handle & 0xFF00) >> 8,cast(int) (handle & 0xFF0000) >> 16);
- }
- /**
- * Returns an integer hash code for the receiver. Any two
- * objects that return <code>true</code> when passed to
- * <code>equals</code> must return the same value for this
- * method.
- *
- * @return the receiver's hash
- *
- * @see #equals
- */
- public int hashCode () {
- return handle;
- }
- /**
- * Allocates the operating system resources associated
- * with the receiver.
- *
- * @param device the device on which to allocate the color
- * @param red the amount of red in the color
- * @param green the amount of green in the color
- * @param blue the amount of blue in the color
- *
- * @exception IllegalArgumentException <ul>
- * <li>ERROR_INVALID_ARGUMENT - if the red, green or blue argument is not between 0 and 255</li>
- * </ul>
- *
- * @see #dispose
- */
- void init_(int red, int green, int blue) {
- if (red > 255 || red < 0 || green > 255 || green < 0 || blue > 255 || blue < 0) {
- SWT.error(SWT.ERROR_INVALID_ARGUMENT);
- }
- handle = (red & 0xFF) | ((green & 0xFF) << 8) | ((blue & 0xFF) << 16);
- /* If this is not a palette-based device, return */
- auto hPal = device.hPalette;
- if (hPal is null) return;
- int[] colorRefCount = device.colorRefCount;
- /* Add this color to the default palette now */
- /* First find out if the color already exists */
- int index = OS.GetNearestPaletteIndex(hPal, handle);
- /* See if the nearest color actually is the color */
- PALETTEENTRY entry;
- OS.GetPaletteEntries(hPal, index, 1, &entry);
- if ((entry.peRed is cast(byte)red) && (entry.peGreen is cast(byte)green) &&
- (entry.peBlue is cast(byte)blue)) {
- /* Found the color. Increment the ref count and return */
- colorRefCount[index]++;
- return;
- }
- /* Didn't find the color, allocate it now. Find the first free entry */
- int i = 0;
- while (i < colorRefCount.length) {
- if (colorRefCount[i] is 0) {
- index = i;
- break;
- }
- i++;
- }
- if (i is colorRefCount.length) {
- /* No free entries, use the closest one */
- /* Remake the handle from the actual rgbs */
- handle = (entry.peRed & 0xFF) | ((entry.peGreen & 0xFF) << 8) |
- ((entry.peBlue & 0xFF) << 16);
- } else {
- /* Found a free entry */
- entry.peRed = cast(BYTE)(red & 0xFF);
- entry.peGreen = cast(BYTE)(green & 0xFF);
- entry.peBlue = cast(BYTE)(blue & 0xFF);
- entry.peFlags = 0;
- OS.SetPaletteEntries(hPal, index, 1, &entry);
- }
- colorRefCount[index]++;
- }
- /**
- * Returns <code>true</code> if the color has been disposed,
- * and <code>false</code> otherwise.
- * <p>
- * This method gets the dispose state for the color.
- * When a color has been disposed, it is an error to
- * invoke any other method using the color.
- *
- * @return <code>true</code> when the color is disposed and <code>false</code> otherwise
- */
- override public bool isDisposed() {
- return handle is -1;
- }
- /**
- * Returns a string containing a concise, human-readable
- * description of the receiver.
- *
- * @return a string representation of the receiver
- */
- override public String toString () {
- if (isDisposed()) return "Color {*DISPOSED*}"; //$NON-NLS-1$
- return Format( "Color {{{}, {}, {}}", getRed(), getGreen(), getBlue()); //$NON-NLS-1$//$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
- }
- /**
- * Invokes platform specific functionality to allocate a new color.
- * <p>
- * <b>IMPORTANT:</b> This method is <em>not</em> part of the public
- * API for <code>Color</code>. It is marked public only so that it
- * can be shared within the packages provided by SWT. It is not
- * available on all platforms, and should never be called from
- * application code.
- * </p>
- *
- * @param device the device on which to allocate the color
- * @param handle the handle for the color
- * @return a new color object containing the specified device and handle
- */
- public static Color win32_new(Device device, int handle) {
- Color color = new Color(device);
- color.disposeChecking = false;
- color.handle = handle;
- return color;
- }
- }