examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/controlexample/CanvasTab.java - platform/eclipse.platform.swt - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2005 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
  *******************************************************************************/
 package org.eclipse.swt.examples.controlexample;


 import org.eclipse.swt.*;
 import org.eclipse.swt.graphics.*;
 import org.eclipse.swt.widgets.*;
 import org.eclipse.swt.events.*;
 import org.eclipse.swt.layout.*;

 class CanvasTab extends Tab {
 	static final int colors [] = {
 		SWT.COLOR_RED,
 		SWT.COLOR_GREEN,
 		SWT.COLOR_BLUE,
 		SWT.COLOR_MAGENTA,
 		SWT.COLOR_YELLOW,
 		SWT.COLOR_CYAN,
 		SWT.COLOR_DARK_RED,
 		SWT.COLOR_DARK_GREEN,
 		SWT.COLOR_DARK_BLUE,
 		SWT.COLOR_DARK_MAGENTA,
 		SWT.COLOR_DARK_YELLOW,
 		SWT.COLOR_DARK_CYAN
 	};
 	static final String canvasString = "Canvas"; //$NON-NLS-1$

 	/* Example widgets and groups that contain them */
 	Canvas canvas;
 	Group canvasGroup;

 	/* Style widgets added to the "Style" group */
 	Button horizontalButton, verticalButton, noBackgroundButton, noFocusButton,
 	noMergePaintsButton, noRedrawResizeButton, doubleBufferedButton;

 	/* Other widgets added to the "Other" group */
 	Button caretButton, fillDamageButton;

 	int paintCount;
 	int cx, cy;
 	int maxX, maxY;

 	/**
 	 * Creates the Tab within a given instance of ControlExample.
 	 */
 	CanvasTab(ControlExample instance) {
 		super(instance);
 	}

 	/**
 	 * Creates the "Other" group.
 	 */
 	void createOtherGroup () {
 		super.createOtherGroup ();

 		/* Create display controls specific to this example */
 		caretButton = new Button (otherGroup, SWT.CHECK);
 		caretButton.setText (ControlExample.getResourceString("Caret"));
 		fillDamageButton = new Button (otherGroup, SWT.CHECK);
 		fillDamageButton.setText (ControlExample.getResourceString("FillDamage"));

 		/* Add the listeners */
 		caretButton.addSelectionListener (new SelectionAdapter () {
 			public void widgetSelected (SelectionEvent event) {
 				setCaret ();
 			}
 		});
 	}

 	/**
 	 * Creates the "Example" group.
 	 */
 	void createExampleGroup () {
 		super.createExampleGroup ();

 		/* Create a group for the canvas widget */
 		canvasGroup = new Group (exampleGroup, SWT.NONE);
 		canvasGroup.setLayout (new GridLayout ());
 		canvasGroup.setLayoutData (new GridData (SWT.FILL, SWT.FILL, true, true));
 		canvasGroup.setText ("Canvas");
 	}

 	/**
 	 * Creates the "Example" widgets.
 	 */
 	void createExampleWidgets () {

 		/* Compute the widget style */
 		int style = getDefaultStyle();
 		if (horizontalButton.getSelection ()) style |= SWT.H_SCROLL;
 		if (verticalButton.getSelection ()) style |= SWT.V_SCROLL;
 		if (borderButton.getSelection ()) style |= SWT.BORDER;
 		if (noBackgroundButton.getSelection ()) style |= SWT.NO_BACKGROUND;
 		if (noFocusButton.getSelection ()) style |= SWT.NO_FOCUS;
 		if (noMergePaintsButton.getSelection ()) style |= SWT.NO_MERGE_PAINTS;
 		if (noRedrawResizeButton.getSelection ()) style |= SWT.NO_REDRAW_RESIZE;
 		if (doubleBufferedButton.getSelection ()) style |= SWT.DOUBLE_BUFFERED;

 		/* Create the example widgets */
 		paintCount = 0; cx = 0; cy = 0;
 		canvas = new Canvas (canvasGroup, style);
 		canvas.addPaintListener(new PaintListener () {
 			public void paintControl(PaintEvent e) {
 				paintCount++;
 				GC gc = e.gc;
 				if (fillDamageButton.getSelection ()) {
 					Color color = e.display.getSystemColor (colors [paintCount % colors.length]);
 					gc.setBackground(color);
 					gc.fillRectangle(e.x, e.y, e.width, e.height);
 				}
 				Point size = canvas.getSize ();
 				gc.drawArc(cx + 1, cy + 1, size.x - 2, size.y - 2, 0, 360);
 				gc.drawRectangle(cx + (size.x - 10) / 2, cy + (size.y - 10) / 2, 10, 10);
 				Point extent = gc.textExtent(canvasString);
 				gc.drawString(canvasString, cx + (size.x - extent.x) / 2, cy - extent.y + (size.y - 10) / 2, true);
 			}
 		});
 		canvas.addControlListener(new ControlAdapter() {
 			public void controlResized(ControlEvent event) {
 				Point size = canvas.getSize ();
 				maxX = size.x * 3 / 2; maxY = size.y * 3 / 2;
 				resizeScrollBars ();
 			}
 		});
 		ScrollBar bar = canvas.getHorizontalBar();
 		if (bar != null) {
 			hookListeners (bar);
 			bar.addSelectionListener(new SelectionAdapter() {
 				public void widgetSelected(SelectionEvent event) {
 					scrollHorizontal ((ScrollBar)event.widget);
 				}
 			});
 		}
 		bar = canvas.getVerticalBar();
 		if (bar != null) {
 			hookListeners (bar);
 			bar.addSelectionListener(new SelectionAdapter() {
 				public void widgetSelected(SelectionEvent event) {
 					scrollVertical ((ScrollBar)event.widget);
 				}
 			});
 		}
 	}

 	/**
 	 * Creates the "Style" group.
 	 */
 	void createStyleGroup() {
 		super.createStyleGroup();

 		/* Create the extra widgets */
 		horizontalButton = new Button (styleGroup, SWT.CHECK);
 		horizontalButton.setText ("SWT.H_SCROLL");
 		horizontalButton.setSelection(true);
 		verticalButton = new Button (styleGroup, SWT.CHECK);
 		verticalButton.setText ("SWT.V_SCROLL");
 		verticalButton.setSelection(true);
 		borderButton = new Button (styleGroup, SWT.CHECK);
 		borderButton.setText ("SWT.BORDER");
 		noBackgroundButton = new Button (styleGroup, SWT.CHECK);
 		noBackgroundButton.setText ("SWT.NO_BACKGROUND");
 		noFocusButton = new Button (styleGroup, SWT.CHECK);
 		noFocusButton.setText ("SWT.NO_FOCUS");
 		noMergePaintsButton = new Button (styleGroup, SWT.CHECK);
 		noMergePaintsButton.setText ("SWT.NO_MERGE_PAINTS");
 		noRedrawResizeButton = new Button (styleGroup, SWT.CHECK);
 		noRedrawResizeButton.setText ("SWT.NO_REDRAW_RESIZE");
 		doubleBufferedButton = new Button (styleGroup, SWT.CHECK);
 		doubleBufferedButton.setText ("SWT.DOUBLE_BUFFERED");
 	}

 	/**
 	 * Creates the tab folder page.
 	 *
 	 * @param tabFolder org.eclipse.swt.widgets.TabFolder
 	 * @return the new page for the tab folder
 	 */
 	Composite createTabFolderPage (TabFolder tabFolder) {
 		super.createTabFolderPage (tabFolder);

 		/*
 		 * Add a resize listener to the tabFolderPage so that
 		 * if the user types into the example widget to change
 		 * its preferred size, and then resizes the shell, we
 		 * recalculate the preferred size correctly.
 		 */
 		tabFolderPage.addControlListener(new ControlAdapter() {
 			public void controlResized(ControlEvent e) {
 				setExampleWidgetSize ();
 			}
 		});

 		return tabFolderPage;
 	}

 	/**
 	 * Gets the "Example" widget children.
 	 */
 	Widget [] getExampleWidgets () {
 		return new Widget [] {canvas};
 	}

 	/**
 	 * Returns a list of set/get API method names (without the set/get prefix)
 	 * that can be used to set/get values in the example control(s).
 	 */
 	String[] getMethodNames() {
 		return new String[] {"ToolTipText"};
 	}

 	/**
 	 * Gets the text for the tab folder item.
 	 */
 	String getTabText () {
 		return "Canvas";
 	}

 	/**
 	 * Resizes the maximum and thumb of both scrollbars.
 	 */
 	void resizeScrollBars () {
 		Rectangle clientArea = canvas.getClientArea();
 		ScrollBar bar = canvas.getHorizontalBar();
 		if (bar != null) {
 			bar.setMaximum(maxX);
 			bar.setThumb(clientArea.width);
 			bar.setPageIncrement(clientArea.width);
 		}
 		bar = canvas.getVerticalBar();
 		if (bar != null) {
 			bar.setMaximum(maxY);
 			bar.setThumb(clientArea.height);
 			bar.setPageIncrement(clientArea.height);
 		}
 	}

 	/**
 	 * Scrolls the canvas horizontally.
 	 *
 	 * @param scrollBar
 	 */
 	void scrollHorizontal (ScrollBar scrollBar) {
 		Rectangle bounds = canvas.getClientArea();
 		int x = -scrollBar.getSelection();
 		if (x + maxX < bounds.width) {
 			x = bounds.width - maxX;
 		}
 		canvas.scroll(x, cy, cx, cy, maxX, maxY, false);
 		cx = x;
 	}

 	/**
 	 * Scrolls the canvas vertically.
 	 *
 	 * @param scrollBar
 	 */
 	void scrollVertical (ScrollBar scrollBar) {
 		Rectangle bounds = canvas.getClientArea();
 		int y = -scrollBar.getSelection();
 		if (y + maxY < bounds.height) {
 			y = bounds.height - maxY;
 		}
 		canvas.scroll(cx, y, cx, cy, maxX, maxY, false);
 		cy = y;
 	}

 	/**
 	 * Sets or clears the caret in the "Example" widget.
 	 */
 	void setCaret () {
 		Caret oldCaret = canvas.getCaret ();
 		if (caretButton.getSelection ()) {
 			Caret newCaret = new Caret(canvas, SWT.NONE);
 			Font font = canvas.getFont();
 			newCaret.setFont(font);
 			GC gc = new GC(canvas);
 			gc.setFont(font);
 			newCaret.setBounds(1, 1, 1, gc.getFontMetrics().getHeight());
 			gc.dispose();
 			canvas.setCaret (newCaret);
 			canvas.setFocus();
 		} else {
 			canvas.setCaret (null);
 		}
 		if (oldCaret != null) oldCaret.dispose ();
 	}

 	/**
 	 * Sets the state of the "Example" widgets.
 	 */
 	void setExampleWidgetState () {
 		super.setExampleWidgetState ();
 		horizontalButton.setSelection ((canvas.getStyle () & SWT.H_SCROLL) != 0);
 		verticalButton.setSelection ((canvas.getStyle () & SWT.V_SCROLL) != 0);
 		borderButton.setSelection ((canvas.getStyle () & SWT.BORDER) != 0);
 		noBackgroundButton.setSelection ((canvas.getStyle () & SWT.NO_BACKGROUND) != 0);
 		noFocusButton.setSelection ((canvas.getStyle () & SWT.NO_FOCUS) != 0);
 		noMergePaintsButton.setSelection ((canvas.getStyle () & SWT.NO_MERGE_PAINTS) != 0);
 		noRedrawResizeButton.setSelection ((canvas.getStyle () & SWT.NO_REDRAW_RESIZE) != 0);
 		doubleBufferedButton.setSelection ((canvas.getStyle () & SWT.DOUBLE_BUFFERED) != 0);
 		if (!instance.startup) setCaret ();
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2000, 2005 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
	*******************************************************************************/
	package org.eclipse.swt.examples.controlexample;


	import org.eclipse.swt.*;
	import org.eclipse.swt.graphics.*;
	import org.eclipse.swt.widgets.*;
	import org.eclipse.swt.events.*;
	import org.eclipse.swt.layout.*;

	class CanvasTab extends Tab {
	static final int colors [] = {
	SWT.COLOR_RED,
	SWT.COLOR_GREEN,
	SWT.COLOR_BLUE,
	SWT.COLOR_MAGENTA,
	SWT.COLOR_YELLOW,
	SWT.COLOR_CYAN,
	SWT.COLOR_DARK_RED,
	SWT.COLOR_DARK_GREEN,
	SWT.COLOR_DARK_BLUE,
	SWT.COLOR_DARK_MAGENTA,
	SWT.COLOR_DARK_YELLOW,
	SWT.COLOR_DARK_CYAN
	};
	static final String canvasString = "Canvas"; //$NON-NLS-1$

	/* Example widgets and groups that contain them */
	Canvas canvas;
	Group canvasGroup;

	/* Style widgets added to the "Style" group */
	Button horizontalButton, verticalButton, noBackgroundButton, noFocusButton,
	noMergePaintsButton, noRedrawResizeButton, doubleBufferedButton;

	/* Other widgets added to the "Other" group */
	Button caretButton, fillDamageButton;

	int paintCount;
	int cx, cy;
	int maxX, maxY;

	/**
	* Creates the Tab within a given instance of ControlExample.
	*/
	CanvasTab(ControlExample instance) {
	super(instance);
	}

	/**
	* Creates the "Other" group.
	*/
	void createOtherGroup () {
	super.createOtherGroup ();

	/* Create display controls specific to this example */
	caretButton = new Button (otherGroup, SWT.CHECK);
	caretButton.setText (ControlExample.getResourceString("Caret"));
	fillDamageButton = new Button (otherGroup, SWT.CHECK);
	fillDamageButton.setText (ControlExample.getResourceString("FillDamage"));

	/* Add the listeners */
	caretButton.addSelectionListener (new SelectionAdapter () {
	public void widgetSelected (SelectionEvent event) {
	setCaret ();
	}
	});
	}

	/**
	* Creates the "Example" group.
	*/
	void createExampleGroup () {
	super.createExampleGroup ();

	/* Create a group for the canvas widget */
	canvasGroup = new Group (exampleGroup, SWT.NONE);
	canvasGroup.setLayout (new GridLayout ());
	canvasGroup.setLayoutData (new GridData (SWT.FILL, SWT.FILL, true, true));
	canvasGroup.setText ("Canvas");
	}

	/**
	* Creates the "Example" widgets.
	*/
	void createExampleWidgets () {

	/* Compute the widget style */
	int style = getDefaultStyle();
	if (horizontalButton.getSelection ()) style \|= SWT.H_SCROLL;
	if (verticalButton.getSelection ()) style \|= SWT.V_SCROLL;
	if (borderButton.getSelection ()) style \|= SWT.BORDER;
	if (noBackgroundButton.getSelection ()) style \|= SWT.NO_BACKGROUND;
	if (noFocusButton.getSelection ()) style \|= SWT.NO_FOCUS;
	if (noMergePaintsButton.getSelection ()) style \|= SWT.NO_MERGE_PAINTS;
	if (noRedrawResizeButton.getSelection ()) style \|= SWT.NO_REDRAW_RESIZE;
	if (doubleBufferedButton.getSelection ()) style \|= SWT.DOUBLE_BUFFERED;

	/* Create the example widgets */
	paintCount = 0; cx = 0; cy = 0;
	canvas = new Canvas (canvasGroup, style);
	canvas.addPaintListener(new PaintListener () {
	public void paintControl(PaintEvent e) {
	paintCount++;
	GC gc = e.gc;
	if (fillDamageButton.getSelection ()) {
	Color color = e.display.getSystemColor (colors [paintCount % colors.length]);
	gc.setBackground(color);
	gc.fillRectangle(e.x, e.y, e.width, e.height);
	}
	Point size = canvas.getSize ();
	gc.drawArc(cx + 1, cy + 1, size.x - 2, size.y - 2, 0, 360);
	gc.drawRectangle(cx + (size.x - 10) / 2, cy + (size.y - 10) / 2, 10, 10);
	Point extent = gc.textExtent(canvasString);
	gc.drawString(canvasString, cx + (size.x - extent.x) / 2, cy - extent.y + (size.y - 10) / 2, true);
	}
	});
	canvas.addControlListener(new ControlAdapter() {
	public void controlResized(ControlEvent event) {
	Point size = canvas.getSize ();
	maxX = size.x * 3 / 2; maxY = size.y * 3 / 2;
	resizeScrollBars ();
	}
	});
	ScrollBar bar = canvas.getHorizontalBar();
	if (bar != null) {
	hookListeners (bar);
	bar.addSelectionListener(new SelectionAdapter() {
	public void widgetSelected(SelectionEvent event) {
	scrollHorizontal ((ScrollBar)event.widget);
	}
	});
	}
	bar = canvas.getVerticalBar();
	if (bar != null) {
	hookListeners (bar);
	bar.addSelectionListener(new SelectionAdapter() {
	public void widgetSelected(SelectionEvent event) {
	scrollVertical ((ScrollBar)event.widget);
	}
	});
	}
	}

	/**
	* Creates the "Style" group.
	*/
	void createStyleGroup() {
	super.createStyleGroup();

	/* Create the extra widgets */
	horizontalButton = new Button (styleGroup, SWT.CHECK);
	horizontalButton.setText ("SWT.H_SCROLL");
	horizontalButton.setSelection(true);
	verticalButton = new Button (styleGroup, SWT.CHECK);
	verticalButton.setText ("SWT.V_SCROLL");
	verticalButton.setSelection(true);
	borderButton = new Button (styleGroup, SWT.CHECK);
	borderButton.setText ("SWT.BORDER");
	noBackgroundButton = new Button (styleGroup, SWT.CHECK);
	noBackgroundButton.setText ("SWT.NO_BACKGROUND");
	noFocusButton = new Button (styleGroup, SWT.CHECK);
	noFocusButton.setText ("SWT.NO_FOCUS");
	noMergePaintsButton = new Button (styleGroup, SWT.CHECK);
	noMergePaintsButton.setText ("SWT.NO_MERGE_PAINTS");
	noRedrawResizeButton = new Button (styleGroup, SWT.CHECK);
	noRedrawResizeButton.setText ("SWT.NO_REDRAW_RESIZE");
	doubleBufferedButton = new Button (styleGroup, SWT.CHECK);
	doubleBufferedButton.setText ("SWT.DOUBLE_BUFFERED");
	}

	/**
	* Creates the tab folder page.
	*
	* @param tabFolder org.eclipse.swt.widgets.TabFolder
	* @return the new page for the tab folder
	*/
	Composite createTabFolderPage (TabFolder tabFolder) {
	super.createTabFolderPage (tabFolder);

	/*
	* Add a resize listener to the tabFolderPage so that
	* if the user types into the example widget to change
	* its preferred size, and then resizes the shell, we
	* recalculate the preferred size correctly.
	*/
	tabFolderPage.addControlListener(new ControlAdapter() {
	public void controlResized(ControlEvent e) {
	setExampleWidgetSize ();
	}
	});

	return tabFolderPage;
	}

	/**
	* Gets the "Example" widget children.
	*/
	Widget [] getExampleWidgets () {
	return new Widget [] {canvas};
	}

	/**
	* Returns a list of set/get API method names (without the set/get prefix)
	* that can be used to set/get values in the example control(s).
	*/
	String[] getMethodNames() {
	return new String[] {"ToolTipText"};
	}

	/**
	* Gets the text for the tab folder item.
	*/
	String getTabText () {
	return "Canvas";
	}

	/**
	* Resizes the maximum and thumb of both scrollbars.
	*/
	void resizeScrollBars () {
	Rectangle clientArea = canvas.getClientArea();
	ScrollBar bar = canvas.getHorizontalBar();
	if (bar != null) {
	bar.setMaximum(maxX);
	bar.setThumb(clientArea.width);
	bar.setPageIncrement(clientArea.width);
	}
	bar = canvas.getVerticalBar();
	if (bar != null) {
	bar.setMaximum(maxY);
	bar.setThumb(clientArea.height);
	bar.setPageIncrement(clientArea.height);
	}
	}

	/**
	* Scrolls the canvas horizontally.
	*
	* @param scrollBar
	*/
	void scrollHorizontal (ScrollBar scrollBar) {
	Rectangle bounds = canvas.getClientArea();
	int x = -scrollBar.getSelection();
	if (x + maxX < bounds.width) {
	x = bounds.width - maxX;
	}
	canvas.scroll(x, cy, cx, cy, maxX, maxY, false);
	cx = x;
	}

	/**
	* Scrolls the canvas vertically.
	*
	* @param scrollBar
	*/
	void scrollVertical (ScrollBar scrollBar) {
	Rectangle bounds = canvas.getClientArea();
	int y = -scrollBar.getSelection();
	if (y + maxY < bounds.height) {
	y = bounds.height - maxY;
	}
	canvas.scroll(cx, y, cx, cy, maxX, maxY, false);
	cy = y;
	}

	/**
	* Sets or clears the caret in the "Example" widget.
	*/
	void setCaret () {
	Caret oldCaret = canvas.getCaret ();
	if (caretButton.getSelection ()) {
	Caret newCaret = new Caret(canvas, SWT.NONE);
	Font font = canvas.getFont();
	newCaret.setFont(font);
	GC gc = new GC(canvas);
	gc.setFont(font);
	newCaret.setBounds(1, 1, 1, gc.getFontMetrics().getHeight());
	gc.dispose();
	canvas.setCaret (newCaret);
	canvas.setFocus();
	} else {
	canvas.setCaret (null);
	}
	if (oldCaret != null) oldCaret.dispose ();
	}

	/**
	* Sets the state of the "Example" widgets.
	*/
	void setExampleWidgetState () {
	super.setExampleWidgetState ();
	horizontalButton.setSelection ((canvas.getStyle () & SWT.H_SCROLL) != 0);
	verticalButton.setSelection ((canvas.getStyle () & SWT.V_SCROLL) != 0);
	borderButton.setSelection ((canvas.getStyle () & SWT.BORDER) != 0);
	noBackgroundButton.setSelection ((canvas.getStyle () & SWT.NO_BACKGROUND) != 0);
	noFocusButton.setSelection ((canvas.getStyle () & SWT.NO_FOCUS) != 0);
	noMergePaintsButton.setSelection ((canvas.getStyle () & SWT.NO_MERGE_PAINTS) != 0);
	noRedrawResizeButton.setSelection ((canvas.getStyle () & SWT.NO_REDRAW_RESIZE) != 0);
	doubleBufferedButton.setSelection ((canvas.getStyle () & SWT.DOUBLE_BUFFERED) != 0);
	if (!instance.startup) setCaret ();
	}
	}