cbanner.java

源码为Eclipse开源开发平台桌面开发工具SWT的源代码,

	Point leftSize = new Point(0, 0);
	if (left != null) {
		Point trim = left.computeSize(width, SWT.DEFAULT);
		trim.x = trim.x - width;
		leftSize = left.computeSize(width - trim.x, SWT.DEFAULT);
	}

	int x = 0;
	int y = 0;
	int oldStart = curveStart;
	Rectangle leftRect = null;
	Rectangle rightRect = null;
	Rectangle bottomRect = null;
	if (bottom != null) {
		bottomRect = new Rectangle(x, y+size.y-bottomSize.y, bottomSize.x, bottomSize.y);
	}
	if (showCurve) y += BORDER_TOP + BORDER_STRIPE;
	if(left != null) {
		leftRect = new Rectangle(x, y, leftSize.x, leftSize.y);
		curveStart = x + leftSize.x - curve_indent;
		x += leftSize.x + curve_width - 2*curve_indent;
	}
	if (right != null) {
		rightRect = new Rectangle(x, y, rightSize.x, rightSize.y);
	}
	if (curveStart < oldStart) {
		redraw(curveStart - CURVE_TAIL, 0, oldStart + curve_width - curveStart + CURVE_TAIL + 5, size.y, false);
	}
	if (curveStart > oldStart) {
		redraw(oldStart - CURVE_TAIL, 0, curveStart + curve_width - oldStart + CURVE_TAIL + 5, size.y, false);
	}
	curveRect = new Rectangle(curveStart, 0, curve_width, size.y);
	update();
	if (bottomRect != null) bottom.setBounds(bottomRect);
	if (rightRect != null) right.setBounds(rightRect);
	if (leftRect != null) left.setBounds(leftRect);
}
void onDispose() {
	if (resizeCursor != null) resizeCursor.dispose();
	resizeCursor = null;
	left = null;
	right = null;
}
void onMouseDown (int x, int y) {
	if (curveRect.contains(x, y)) {
		dragging = true;
		rightDragDisplacement = curveStart - x + curve_width - curve_indent;
	}
}
void onMouseExit() {
	if (!dragging) setCursor(null);
}
void onMouseMove(int x, int y) {
	if (dragging) {
		Point size = getSize();
		if (!(0 < x && x < size.x)) return;
		rightWidth = size.x - x - rightDragDisplacement;
		rightWidth = Math.max(MIN_RIGHT, rightWidth);
		layout();
		return;
	}
	if (curveRect.contains(x, y)) {
		setCursor(resizeCursor); 
	} else {
		setCursor(null);
	}
}
void onMouseUp () {
	dragging = false;
}
void onPaint(GC gc) {
//	 Useful for debugging paint problems
//	{
//	Point size = getSize();	
//	gc.setBackground(getDisplay().getSystemColor(SWT.COLOR_GREEN));
//	gc.fillRectangle(-10, -10, size.x+20, size.y+20);
//	}
	Point size = getSize();
	Color border1 = getDisplay().getSystemColor(BORDER1);
	
	if (bottom != null && (left != null || right != null)) {
		gc.setForeground(border1);
		int y = bottom.getBounds().y - BORDER_BOTTOM - BORDER_STRIPE;
		gc.drawLine(0, y, size.x, y);
	}
	
	if (left == null || right == null) return;
	int[] line1 = new int[curve.length+6];
	int index = 0;
	int x = curveStart;
	int y = 0;
	line1[index++] = x + 1;
	line1[index++] = size.y - BORDER_STRIPE;
	for (int i = 0; i < curve.length/2; i++) {
		line1[index++]=x+curve[2*i];
		line1[index++]=y+curve[2*i+1];
	}
	line1[index++] = x + curve_width;
	line1[index++] = 0;
	line1[index++] = size.x;
	line1[index++] = 0;
	
	Color background = getBackground();
		
	if (getDisplay().getDepth() >= 15) {
		// Anti- aliasing
		int[] line2 = new int[line1.length];
		index = 0;
		for (int i = 0; i < line1.length/2; i++) { 
			line2[index] = line1[index++]  - 1;
			line2[index] = line1[index++];
		}
		int[] line3 = new int[line1.length];
		index = 0;
		for (int i = 0; i < line1.length/2; i++) {
			line3[index] = line1[index++] + 1;
			line3[index] = line1[index++];
		}
		RGB from = border1.getRGB();
		RGB to = background.getRGB();
		int red = from.red + 3*(to.red - from.red)/4;
		int green = from.green + 3*(to.green - from.green)/4;
		int blue = from.blue + 3*(to.blue - from.blue)/4;
		Color color = new Color(getDisplay(), red, green, blue);
		gc.setForeground(color);
		gc.drawPolyline(line2);
		gc.drawPolyline(line3);
		color.dispose();
		
		// draw tail fading to background
		int x1 = Math.max(0, curveStart - CURVE_TAIL);
		gc.setForeground(background);
		gc.setBackground(border1);
		gc.fillGradientRectangle(x1, size.y - BORDER_STRIPE, curveStart-x1+1, 1, false);
	} else {
		// draw solid tail
		int x1 = Math.max(0, curveStart - CURVE_TAIL);
		gc.setForeground(border1);
		gc.drawLine(x1, size.y - BORDER_STRIPE, curveStart+1, size.y - BORDER_STRIPE);
	}
	
	// draw border
	gc.setForeground(border1);
	gc.drawPolyline(line1);
}

void onResize() {
	updateCurve(getSize().y);
	layout();
}
/**
* Set the control that appears on the bottom side of the banner.
* The bottom control is optional.  Setting the bottom control to null will remove it from 
* the banner - however, the creator of the control must dispose of the control.
* 
* @param control the control to be displayed on the bottom or null
* 
* @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>
*    <li>ERROR_INVALID_ARGUMENT - if the bottom control was not created as a child of the receiver</li>
* </ul>
* 
* @since 3.0
*/
public void setBottom(Control control) {
	checkWidget();
	if (control != null && control.getParent() != this) {
		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	}
	if (bottom != null && !bottom.isDisposed()) {
		Point size = bottom.getSize();
		bottom.setLocation(OFFSCREEN - size.x, OFFSCREEN - size.y);
	}
	bottom = control;
	layout();
}
/**
 * Sets the layout which is associated with the receiver to be
 * the argument which may be null.
 * <p>
 * Note : CBanner does not use a layout class to size and position its children.
 * </p>
 *
 * @param layout the receiver's new layout or null
 *
 * @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 setLayout (Layout layout) {
	checkWidget();
	return;
}

/**
* Set the control that appears on the left side of the banner.
* The left control is optional.  Setting the left control to null will remove it from 
* the banner - however, the creator of the control must dispose of the control.
* 
* @param control the control to be displayed on the left or null
* 
* @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>
*    <li>ERROR_INVALID_ARGUMENT - if the left control was not created as a child of the receiver</li>
* </ul>
* 
* @since 3.0
*/
public void setLeft(Control control) {
	checkWidget();
	if (control != null && control.getParent() != this) {
		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	}
	if (left != null && !left.isDisposed()) {
		Point size = left.getSize();
		left.setLocation(OFFSCREEN - size.x, OFFSCREEN - size.y);
	}
	left = control;
	layout();
}
/**
* Set the control that appears on the right side of the banner.
* The right control is optional.  Setting the right control to null will remove it from 
* the banner - however, the creator of the control must dispose of the control.
* 
* @param control the control to be displayed on the right or null
* 
* @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>
*    <li>ERROR_INVALID_ARGUMENT - if the right control was not created as a child of the receiver</li>
* </ul>
* 
* @since 3.0
*/
public void setRight(Control control) {
	checkWidget();
	if (control != null && control.getParent() != this) {
		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	}
	if (right != null && !right.isDisposed()) {
		Point size = right.getSize();
		right.setLocation(OFFSCREEN - size.x, OFFSCREEN - size.y);
	}
	right = control;
	layout();
}
/**
 * Set the width of the control control that appears on the right side of the banner.
 * 
 * @param width the width of the control on the right
 * 
 * @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>
 * 
 * @since 3.0
 */
public void setRightWidth(int width) {
	checkWidget();
	if (width < SWT.DEFAULT) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	rightWidth = width;
	layout(true);
}
/**
 * Sets the shape that the CBanner will use to render itself.  
 * 
 * @param simple <code>true</code> if the CBanner should render itself in a simple, traditional style
 * 
 * @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>
 *
 * @since 3.0
 */
public void setSimple(boolean simple) {
	checkWidget();
	if (this.simple != simple) {
		this.simple = simple;
		if (simple) {
			curve_width = 5;
			curve_indent = -2;
		} else {
			curve_width = 50;
			curve_indent = 5;
		}
		updateCurve(getSize().y);
		layout();
		redraw();
	}
}
void updateCurve(int height) {
	int h = height - BORDER_STRIPE;
	if (simple) {
		curve = new int[] {0,h, 1,h, 2,h-1, 3,h-2,
			                       3,2, 4,1, 5,0,};
	} else {
		curve = bezier(0, h+1, BEZIER_LEFT, h+1,
				             curve_width-BEZIER_RIGHT, 0, curve_width, 0,
		                     curve_width);
	}
}
}