ctabitem.java

源码为Eclipse开源开发平台桌面开发工具SWT的源代码,

		gc.drawText(shortenedText, xDraw, textY, FLAGS);
		gc.setFont(gcFont);
		
		// draw a Focus rectangle
		if (parent.isFocusControl()) {
			Display display = getDisplay();
			if (parent.simple || parent.single) {
				gc.setBackground(display.getSystemColor(SWT.COLOR_BLACK));
				gc.setForeground(display.getSystemColor(SWT.COLOR_WHITE));
				gc.drawFocus(xDraw-1, textY-1, extent.x+2, extent.y+2);
			} else {
				gc.setForeground(display.getSystemColor(CTabFolder.BUTTON_BORDER));
				gc.drawLine(xDraw, textY+extent.y+1, xDraw+extent.x+1, textY+extent.y+1);
			}
		}
	}
	if (parent.showClose || showClose) drawClose(gc);
}
void drawUnselected(GC gc) {
	// Do not draw partial items
	if (!isShowing()) return;
	
	Rectangle clipping = gc.getClipping();
	Rectangle bounds = getBounds();
	if (!clipping.intersects(bounds)) return;
	
	// draw border
	if (parent.indexOf(this) != parent.selectedIndex - 1) {
		gc.setForeground(CTabFolder.borderColor);
		gc.drawLine(x + width - 1, y, x + width - 1, y + height);
	}
	// draw Image
	int xDraw = x + LEFT_MARGIN;
	Image image = getImage();
	if (image != null && parent.showUnselectedImage) {
		Rectangle imageBounds = image.getBounds();
		// only draw image if it won't overlap with close button
		int maxImageWidth = x + width - xDraw - RIGHT_MARGIN;
		if (parent.showUnselectedClose && (parent.showClose || showClose)) {
			maxImageWidth -= closeRect.width + INTERNAL_SPACING;
		}
		if (imageBounds.width < maxImageWidth) {		
			int imageX = xDraw;
			int imageHeight = imageBounds.height;
			int imageY = y + (height - imageHeight) / 2;
			imageY += parent.onBottom ? -1 : 1;
			int imageWidth = imageBounds.width * imageHeight / imageBounds.height;
			gc.drawImage(image, 
				         imageBounds.x, imageBounds.y, imageBounds.width, imageBounds.height,
				         imageX, imageY, imageWidth, imageHeight);
			xDraw += imageWidth + INTERNAL_SPACING;
		}
	}
	// draw Text
	int textWidth = x + width - xDraw - RIGHT_MARGIN;
	if (parent.showUnselectedClose && (parent.showClose || showClose)) {
		textWidth -= closeRect.width + INTERNAL_SPACING;
	}
	if (textWidth > 0) {
		Font gcFont = gc.getFont();
		gc.setFont(font == null ? parent.getFont() : font);
		if (shortenedText == null || shortenedTextWidth != textWidth) {
			shortenedText = shortenText(gc, getText(), textWidth);
			shortenedTextWidth = textWidth;
		}	
		Point extent = gc.textExtent(shortenedText, FLAGS);
		int textY = y + (height - extent.y) / 2;
		textY += parent.onBottom ? -1 : 1;
		gc.setForeground(parent.getForeground());
		gc.drawText(shortenedText, xDraw, textY, FLAGS);
		gc.setFont(gcFont);
	}
	// draw close
	if (parent.showUnselectedClose && (parent.showClose || showClose)) drawClose(gc);
}
/**
 * Returns a rectangle describing the receiver's size and location
 * relative to its parent.
 *
 * @return the receiver's bounding column rectangle
 *
 * @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 Rectangle getBounds () {
	//checkWidget();
	int w = width;
	if (!parent.simple && !parent.single && parent.indexOf(this) == parent.selectedIndex) w += parent.curveWidth - parent.curveIndent;
	return new Rectangle(x, y, w, height);
}
/**
* Gets the control that is displayed in the content are of the tab item.
*
* @return the control
*
* @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 Control getControl () {
	checkWidget();
	return control;
}
/**
 * Get the image displayed in the tab if the tab is disabled.
 * 
 * @return the disabled image 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>
 * 
 * @deprecated the disabled image is not used
 */
public Image getDisabledImage(){
	checkWidget();
	return disabledImage;
}
/**
 * Returns the font that the receiver will use to paint textual information.
 *
 * @return the receiver's font
 *
 * @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 Font getFont() {
	checkWidget();
	if (font != null) return font;
	return parent.getFont();
}
/**
 * Returns the receiver's parent, which must be a <code>CTabFolder</code>.
 *
 * @return the receiver's parent
 * 
 * @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 CTabFolder getParent () {
	//checkWidget();
	return parent;
}
/**
 * Returns the receiver's tool tip text, or null if it has
 * not been set.
 *
 * @return the receiver's tool tip text
 *
 * @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 String getToolTipText () {
	checkWidget();
	if (toolTipText == null && shortenedText != null) {
		String text = getText();
		if (!shortenedText.equals(text)) return text;
	}
	return toolTipText;
}
/**
* Returns <code>true</code> if the item will be rendered in the visible area of the CTabFolder. Returns false otherwise.
* 
*  @return <code>true</code> if the item will be rendered in the visible area of the CTabFolder. Returns false otherwise.
* 
*  @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 boolean isShowing () {
	checkWidget();
	int index = parent.indexOf(this);
	int rightEdge = parent.getRightItemEdge();
	if (parent.single) {
		if (index == parent.selectedIndex) {
			return x <= rightEdge;
		}
		return false;
	}
	if (index < parent.firstIndex) return false;
	if (parent.firstIndex == index) {
		return x <= rightEdge;
	}
	int extra = parent.simple || index != parent.selectedIndex ? 0 : parent.curveWidth - 2*parent.curveIndent;
	return x + width + extra <= rightEdge;
}
void onPaint(GC gc, boolean isSelected) {
	if (width == 0 || height == 0) return;
	if (isSelected) {
		drawSelected(gc);
	} else {
		drawUnselected(gc);
	}
}
int preferredHeight(GC gc) {
	Image image = getImage();
	int h = (image == null) ? 0 : image.getBounds().height;
	String text = getText();
	if (font == null) {
		h = Math.max(h, gc.textExtent(text, FLAGS).y);
	} else {
		Font gcFont = gc.getFont();
		gc.setFont(font);
		h = Math.max(h, gc.textExtent(text, FLAGS).y);
		gc.setFont(gcFont);
	}
	return h + TOP_MARGIN + BOTTOM_MARGIN;
}
int preferredWidth(GC gc, boolean isSelected, boolean minimum) {
	// NOTE: preferred width does not include the "dead space" caused
	// by the curve.
	if (isDisposed()) return 0;
	int w = 0;
	Image image = getImage();
	if (image != null && (isSelected || parent.showUnselectedImage)) {
		w += image.getBounds().width;
	}
	String text = null;
	if (minimum) {
		int minChars = parent.minChars;
		text = minChars == 0 ? null : getText();
		if (text != null && text.length() > minChars) {
			int end = minChars < ELLIPSIS.length() + 1 ? minChars : minChars - ELLIPSIS.length();
			text = text.substring(0, end);
			if (minChars > ELLIPSIS.length() + 1) text += ELLIPSIS;
		}
	} else {
		text = getText();
	}
	if (text != null) {
		if (w > 0) w += INTERNAL_SPACING;
		if (font == null) {
			w += gc.textExtent(text, FLAGS).x;
		} else {
			Font gcFont = gc.getFont();
			gc.setFont(font);
			w += gc.textExtent(text, FLAGS).x;
			gc.setFont(gcFont);
		}
	}
	if (parent.showClose || showClose) {
		if (isSelected || parent.showUnselectedClose) {
			if (w > 0) w += INTERNAL_SPACING;
			w += CTabFolder.BUTTON_SIZE;
		}
	}
	return w + LEFT_MARGIN + RIGHT_MARGIN;
}
/**
 * Sets the control that is used to fill the client area of
 * the tab folder when the user selects the tab item.
 *
 * @param control the new control (or null)
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the control has been disposed</li> 
 *    <li>ERROR_INVALID_PARENT - if the control is not in the same widget tree</li>
 * </ul>
 * @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 setControl (Control control) {
	checkWidget();
	if (control != null) {
		if (control.isDisposed()) SWT.error (SWT.ERROR_INVALID_ARGUMENT);
		if (control.getParent() != parent) SWT.error (SWT.ERROR_INVALID_PARENT);
	}
	if (this.control != null && !this.control.isDisposed()) {
		this.control.setVisible(false);
	}
	this.control = control;
	if (this.control != null) {
		int index = parent.indexOf (this);
		if (index == parent.getSelectionIndex ()){
			this.control.setBounds(parent.getClientArea ());
			this.control.setVisible(true);
		} else {
			this.control.setVisible(false);
		}
	}
}
/**
 * Sets the image that is displayed if the tab item is disabled.
 * Null will clear the image.
 * 
 * @param image the image to be displayed when the item is disabled 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>
 * 
 * @deprecated This image is not used
 */
public void setDisabledImage (Image image) {
	checkWidget();
	if (image != null && image.isDisposed ()) {
		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	}
	this.disabledImage = image;
}
/**
 * Sets the font that the receiver will use to paint textual information
 * for this item to the font specified by the argument, or to the default font
 * for that kind of control if the argument is null.
 *
 * @param font the new font (or null)
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the argument has been disposed</li> 
 * </ul>
 * @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 setFont (Font font){
	checkWidget();
	if (font != null && font.isDisposed ()) {
		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	}
	if (font == null && this.font == null) return;
	if (font != null && font.equals(this.font)) return;
	this.font = font;
	if (!parent.updateTabHeight(false)) {
		parent.updateItems();
		parent.redraw();
	}
}
public void setImage (Image image) {
	checkWidget();
	if (image != null && image.isDisposed ()) {
		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	}
	Image oldImage = getImage();
	if (image == null && oldImage == null) return;
	if (image != null && image.equals(oldImage)) return;
	super.setImage(image);
	if (!parent.updateTabHeight(false)) {
		parent.updateItems();
	}
	parent.redraw();
}
public void setText (String string) {
	checkWidget();
	if (string == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
	if (string.equals(getText())) return;
	super.setText(string);
	shortenedText = null;
	shortenedTextWidth = 0;
	parent.updateItems();
	parent.redraw();
}
/**
 * Sets the receiver's tool tip text to the argument, which
 * may be null indicating that no tool tip text should be shown.
 *
 * @param string the new tool tip text (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 setToolTipText (String string) {
	checkWidget();
	toolTipText = string;
}
}