viewform.java

源码为Eclipse开源开发平台桌面开发工具SWT的源代码,

	int minTopWidth = leftSize.x + centerSize.x + rightSize.x + 2*marginWidth + 2*highlight;
	int count = -1;
	if (leftSize.x > 0) count++;
	if (centerSize.x > 0) count++;
	if (rightSize.x > 0) count++;
	if (count > 0) minTopWidth += count * horizontalSpacing;
		
	int x = rect.x + rect.width - marginWidth - highlight;
	int y = rect.y + marginHeight + highlight;
	
	boolean top = false;
	if (separateTopCenter || minTopWidth > rect.width) {
		int topHeight = Math.max(rightSize.y, leftSize.y);
		if (topRight != null && !topRight.isDisposed()) {
			top = true;
			x -= rightSize.x;
			topRight.setBounds(x, y, rightSize.x, topHeight);
			x -= horizontalSpacing;
		}
		if (topLeft != null && !topLeft.isDisposed()) {
			top = true;
			leftSize = topLeft.computeSize(x - rect.x - marginWidth - highlight, SWT.DEFAULT);
			topLeft.setBounds(rect.x + marginWidth + highlight, y, leftSize.x, topHeight);
		}
		if (top) y += topHeight + verticalSpacing;
		if (topCenter != null && !topCenter.isDisposed()) {
			top = true;
			int w = rect.width - 2*marginWidth - 2*highlight;
			int trim = topCenter.computeSize(w, SWT.DEFAULT).x - w;
			centerSize = topCenter.computeSize(w - trim, SWT.DEFAULT);
			topCenter.setBounds(rect.x + rect.width - marginWidth - highlight - centerSize.x, y, centerSize.x, centerSize.y);
			y += centerSize.y + verticalSpacing;
		}		
	} else {
		int topHeight = Math.max(rightSize.y, Math.max(centerSize.y, leftSize.y));
		if (topRight != null && !topRight.isDisposed()) {
			top = true;
			x -= rightSize.x;
			topRight.setBounds(x, y, rightSize.x, topHeight);
			x -= horizontalSpacing;
		}
		if (topCenter != null && !topCenter.isDisposed()) {
			top = true;
			x -= centerSize.x;
			topCenter.setBounds(x, y, centerSize.x, topHeight);
			x -= horizontalSpacing;
		}
		if (topLeft != null && !topLeft.isDisposed()) {
			top = true;
			leftSize = topLeft.computeSize(x - rect.x - marginWidth - highlight, topHeight);
			topLeft.setBounds(rect.x + marginWidth + highlight, y, leftSize.x, topHeight);
		}
		if (top)y += topHeight + verticalSpacing;
	}
	int oldSeperator = separator;
	separator = -1;
	if (content != null && !content.isDisposed()) {
		if (topLeft != null || topRight!= null || topCenter != null){
			separator = y;
			y++;
		}
		 content.setBounds(rect.x + marginWidth + highlight, y, rect.width - 2 * marginWidth - 2*highlight, rect.y + rect.height - y - marginHeight - highlight);
	}
	if (oldSeperator != -1 && separator != -1) {
		int t = Math.min(separator, oldSeperator);
		int b = Math.max(separator, oldSeperator);
		redraw(borderLeft, t, getSize().x - borderLeft - borderRight, b - t, false);
	}
}
void onDispose() {
	topLeft = null;
	topCenter = null;
	topRight = null;
	content = null;
	oldArea = null;
	selectionBackground = null;
}
void onPaint(GC gc) {
	Color gcForeground = gc.getForeground();
	Point size = getSize();
	Color border = getDisplay().getSystemColor(BORDER1_COLOR);
	if (showBorder) {
		gc.setForeground(border);
		gc.drawRectangle(0, 0, size.x - 1, size.y - 1);
		if (highlight > 0) {
			int x1 = 1;
			int y1 = 1;
			int x2 = size.x - 1;
			int y2 = size.y - 1;
			int[] shape = new int[] {x1,y1, x2,y1, x2,y2, x1,y2, x1,y1+highlight,
					           x1+highlight,y1+highlight, x1+highlight,y2-highlight, 
							   x2-highlight,y2-highlight, x2-highlight,y1+highlight, x1,y1+highlight};
			Color highlightColor = getDisplay().getSystemColor(SWT.COLOR_LIST_SELECTION);
			gc.setBackground(highlightColor);
			gc.fillPolygon(shape);
		}
	}
	if (separator > -1) {
		gc.setForeground(border);
		gc.drawLine(borderLeft + highlight, separator, size.x - borderLeft - borderRight - highlight, separator);
	}
	gc.setForeground(gcForeground);
}
void onResize() {
	layout();
	
	Rectangle area = super.getClientArea();
	if (oldArea == null || oldArea.width == 0 || oldArea.height == 0) {
		redraw();
	} else {
		int width = 0;
		if (oldArea.width < area.width) {
			width = area.width - oldArea.width + borderRight + highlight;
		} else if (oldArea.width > area.width) {
			width = borderRight + highlight;			
		}
		redraw(area.x + area.width - width, area.y, width, area.height, false);
		
		int height = 0;
		if (oldArea.height < area.height) {
			height = area.height - oldArea.height + borderBottom + highlight;		
		}
		if (oldArea.height > area.height) {
			height = borderBottom + highlight;		
		}
		redraw(area.x, area.y + area.height - height, area.width, height, false);
	}
	oldArea = area;
}
/**
* Sets the content.
* Setting the content to null will remove it from 
* the pane - however, the creator of the content must dispose of the content.
* 
* @param content the control to be displayed in the content area 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 control is not a child of this ViewForm</li>
* </ul>
*/
public void setContent(Control content) {
	checkWidget();
	if (content != null && content.getParent() != this) {
		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	}
	if (this.content != null && !this.content.isDisposed()) {
		this.content.setBounds(OFFSCREEN, OFFSCREEN, 0, 0);
	}
	this.content = content;
	layout();
}

public void setFont(Font f) {
	super.setFont(f);
	if (topLeft != null && !topLeft.isDisposed()) topLeft.setFont(f);
	if (topCenter != null && !topCenter.isDisposed()) topCenter.setFont(f);
	if (topRight != null && !topRight.isDisposed()) topRight.setFont(f);
	layout();
}
/**
 * Sets the layout which is associated with the receiver to be
 * the argument which may be null.
 * <p>
 * Note : ViewForm 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;
}
void setSelectionBackground (Color color) {
	checkWidget();
	if (selectionBackground == color) return;
	if (color == null) color = getDisplay().getSystemColor(SELECTION_BACKGROUND);
	selectionBackground = color;
	redraw();
}
/**
* Set the control that appears in the top center of the pane.
* Typically this is a toolbar.
* The topCenter is optional.  Setting the topCenter to null will remove it from 
* the pane - however, the creator of the topCenter must dispose of the topCenter.
* 
* @param topCenter the control to be displayed in the top center 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 control is not a child of this ViewForm</li>
* </ul>
*/
public void setTopCenter(Control topCenter) {
	checkWidget();
	if (topCenter != null && topCenter.getParent() != this) {
		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	}
	if (this.topCenter != null && !this.topCenter.isDisposed()) {
		Point size = this.topCenter.getSize();
		this.topCenter.setLocation(OFFSCREEN - size.x, OFFSCREEN - size.y);
	}
	this.topCenter = topCenter;
	layout();
}
/**
* Set the control that appears in the top left corner of the pane.
* Typically this is a label such as CLabel.
* The topLeft is optional.  Setting the top left control to null will remove it from 
* the pane - however, the creator of the control must dispose of the control.
* 
* @param c the control to be displayed in the top left corner 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 control is not a child of this ViewForm</li>
* </ul>
*/
public void setTopLeft(Control c) {
	checkWidget();
	if (c != null && c.getParent() != this) {
		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	}
	if (this.topLeft != null && !this.topLeft.isDisposed()) {
		Point size = this.topLeft.getSize();
		this.topLeft.setLocation(OFFSCREEN - size.x, OFFSCREEN - size.y);
	}
	this.topLeft = c;
	layout();
}
/**
* Set the control that appears in the top right corner of the pane.
* Typically this is a Close button or a composite with a Menu and Close button.
* The topRight is optional.  Setting the top right control to null will remove it from 
* the pane - however, the creator of the control must dispose of the control.
* 
* @param c the control to be displayed in the top right corner 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 control is not a child of this ViewForm</li>
* </ul>
*/
public void setTopRight(Control c) {
	checkWidget();
	if (c != null && c.getParent() != this) {
		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	}
	if (this.topRight != null && !this.topRight.isDisposed()) {
		Point size = this.topRight.getSize();
		this.topRight.setLocation(OFFSCREEN - size.x, OFFSCREEN - size.y);
	}
	this.topRight = c;
	layout();
}
/**
* Specify whether the border should be displayed or not.
* 
* @param show true if the border should be displayed
* 
* @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 setBorderVisible(boolean show) {
	checkWidget();
	if (showBorder == show) return;
	
	showBorder = show;
	if (showBorder) {
		borderLeft = borderTop = borderRight = borderBottom = 1;
		if ((getStyle() & SWT.FLAT)== 0) highlight = 2;
	} else {
		borderBottom = borderTop = borderLeft = borderRight = 0;
		highlight = 0;
	}
	layout();
	redraw();
}
/**
* If true, the topCenter will always appear on a separate line by itself, otherwise the 
* topCenter will appear in the top row if there is room and will be moved to the second row if
* required.
* 
* @param show true if the topCenter will always appear on a separate line by itself
* 
* @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 setTopCenterSeparate(boolean show) {
	checkWidget();
	separateTopCenter = show;
	layout();
}

}