sashform.java

源码为Eclipse开源开发平台桌面开发工具SWT的源代码,

	if (controls.length == 0) return;
	
	int sashwidth = sashes.length > 0 ? SASH_WIDTH + sashes [0].getBorderWidth() * 2 : SASH_WIDTH;
	// get the ratios
	long[] ratios = new long[controls.length];
	long total = 0;
	for (int i = 0; i < controls.length; i++) {
		Long ratio = (Long)controls[i].getData(LAYOUT_RATIO);
		if (ratio != null) {
			ratios[i] = ratio.longValue();
		} else {
			ratios[i] = ((200 << 16) + 999) / 1000;
		}
		total += ratios[i];
	}
	
	if (orientation == SWT.HORIZONTAL) {
		total += (((long)(sashes.length * sashwidth) << 16) + area.width - 1) / area.width;
	} else {
		total += (((long)(sashes.length * sashwidth) << 16) + area.height - 1) / area.height;
	}

	if (orientation == SWT.HORIZONTAL) {
		int width = (int)(ratios[0] * area.width / total);
		int x = area.x;
		controls[0].setBounds(x, area.y, width, area.height);
		x += width;
		for (int i = 1; i < controls.length - 1; i++) {
			sashes[i - 1].setBounds(x, area.y, sashwidth, area.height);
			x += sashwidth;
			width = (int)(ratios[i] * area.width / total);
			controls[i].setBounds(x, area.y, width, area.height);
			x += width;
		}
		if (controls.length > 1) {
			sashes[sashes.length - 1].setBounds(x, area.y, sashwidth, area.height);
			x += sashwidth;
			width = area.width - x;
			controls[controls.length - 1].setBounds(x, area.y, width, area.height);
		}
	} else {
		int height = (int)(ratios[0] * area.height / total);
		int y = area.y;
		controls[0].setBounds(area.x, y, area.width, height);
		y += height;
		for (int i = 1; i < controls.length - 1; i++) {
			sashes[i - 1].setBounds(area.x, y, area.width, sashwidth);
			y += sashwidth;
			height = (int)(ratios[i] * area.height / total);
			controls[i].setBounds(area.x, y, area.width, height);
			y += height;
		}
		if (controls.length > 1) {
			sashes[sashes.length - 1].setBounds(area.x, y, area.width, sashwidth);
			y += sashwidth;
			height = area.height - y;
			controls[controls.length - 1].setBounds(area.x, y, area.width, height);
		}

	}
}
void onDragSash(Event event) {
	if (event.detail == SWT.DRAG) {
		// constrain feedback
		Rectangle area = getClientArea();
		if (orientation == SWT.HORIZONTAL) {
			event.x = Math.min(Math.max(DRAG_MINIMUM, event.x), area.width - DRAG_MINIMUM);
		} else {
			event.y = Math.min(Math.max(DRAG_MINIMUM, event.y), area.height - DRAG_MINIMUM);
		}
		return;
	}

	Sash sash = (Sash)event.widget;
	int sashIndex = -1;
	for (int i= 0; i < sashes.length; i++) {
		if (sashes[i] == sash) {
			sashIndex = i;
			break;
		}
	}
	if (sashIndex == -1) return;

	Control c1 = controls[sashIndex];
	Control c2 = controls[sashIndex + 1];
	Rectangle b1 = c1.getBounds();
	Rectangle b2 = c2.getBounds();
	
	Rectangle sashBounds = sash.getBounds();
	Rectangle area = getClientArea();
	if (orientation == SWT.HORIZONTAL) {
		int shift = event.x - sashBounds.x;
		b1.width += shift;
		b2.x += shift;
		b2.width -= shift;
		if (b1.width < DRAG_MINIMUM || b2.width < DRAG_MINIMUM) {
			return;
		}
		c1.setData(LAYOUT_RATIO, new Long((((long)b1.width << 16) + area.width - 1) / area.width));
		c2.setData(LAYOUT_RATIO, new Long((((long)b2.width << 16) + area.width - 1) / area.width));		
	} else {
		int shift = event.y - sashBounds.y;
		b1.height += shift;
		b2.y += shift;
		b2.height -= shift;
		if (b1.height < DRAG_MINIMUM || b2.height < DRAG_MINIMUM) {
			return;
		}
		c1.setData(LAYOUT_RATIO, new Long((((long)b1.height << 16) + area.height - 1) / area.height));
		c2.setData(LAYOUT_RATIO, new Long((((long)b2.height << 16) + area.height - 1) / area.height));
	}
	
	c1.setBounds(b1);
	sash.setBounds(event.x, event.y, event.width, event.height);
	c2.setBounds(b2);
}
/**
 * If orientation is SWT.HORIZONTAL, lay the controls in the SashForm 
 * out side by side.  If orientation is SWT.VERTICAL, lay the 
 * controls in the SashForm out top to bottom.
 * 
 * @param orientation SWT.HORIZONTAL or SWT.VERTICAL
 * 
 * @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 value of orientation is not SWT.HORIZONTAL or SWT.VERTICAL
 * </ul>
 */
public void setOrientation(int orientation) {
	checkWidget();
	if (this.orientation == orientation) return;
	if (orientation != SWT.HORIZONTAL && orientation != SWT.VERTICAL) {
		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	}
	this.orientation = orientation;
	
	int sashStyle = (orientation == SWT.HORIZONTAL) ? SWT.VERTICAL : SWT.HORIZONTAL;
	if ((getStyle() & SWT.BORDER) != 0) sashStyle |= SWT.BORDER;
	for (int i = 0; i < sashes.length; i++) {
		sashes[i].dispose();
		sashes[i] = new Sash(this, sashStyle);
		sashes[i].setBackground(background);
		sashes[i].setForeground(foreground);
		sashes[i].addListener(SWT.Selection, sashListener);
	}
	layout();
}
public void setBackground (Color color) {
	super.setBackground(color);
	background = color;
	for (int i = 0; i < sashes.length; i++) {
		sashes[i].setBackground(background);
	}
}
public void setForeground (Color color) {
	super.setForeground(color);
	foreground = color;
	for (int i = 0; i < sashes.length; i++) {
		sashes[i].setForeground(foreground);
	}
}
public void setLayout (Layout layout) {
	checkWidget();
}
/**
 * Specify the control that should take up the entire client area of the SashForm.  
 * If one control has been maximized, and this method is called with a different control, 
 * the previous control will be minimized and the new control will be maximized..
 * if the value of control is null, the SashForm will minimize all controls and return to
 * the default layout where all controls are laid out separated by sashes.
 * 
 * @param control the control to be maximized 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 setMaximizedControl(Control control){
	checkWidget();
	if (control == null) {
		if (maxControl != null) {
			this.maxControl = null;
			layout();
			for (int i= 0; i < sashes.length; i++){
				sashes[i].setVisible(true);
			}
		}
		return;
	}
	
	for (int i= 0; i < sashes.length; i++){
		sashes[i].setVisible(false);
	}
	maxControl = control;
	layout();
}

/**
 * Specify the relative weight of each child in the SashForm.  This will determine
 * what percent of the total width (if SashForm has Horizontal orientation) or 
 * total height (if SashForm has Vertical orientation) each control will occupy.
 * The weights must be positive values and there must be an entry for each
 * non-sash child of the SashForm.
 * 
 * @param weights the relative weight of each child
 * 
 * @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 weights value is null or of incorrect length (must match the number of children)</li>
 * </ul>
 */
public void setWeights(int[] weights) {
	checkWidget();
	Control[] cArray = getControls(false);
	if (weights == null || weights.length != cArray.length) {
		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	}
	
	int total = 0;
	for (int i = 0; i < weights.length; i++) {
		if (weights[i] < 0) {
			SWT.error(SWT.ERROR_INVALID_ARGUMENT);
		}
		total += weights[i];
	}
	if (total == 0) {
		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	}
	for (int i = 0; i < cArray.length; i++) {
		cArray[i].setData(LAYOUT_RATIO, new Long((((long)weights[i] << 16) + total - 1) / total));
	}

	layout();
}
}