/*******************************************************************************
* Copyright (c) 2000, 2016 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
* Patrick Tasse - Add support for SWTBotCanvas
*******************************************************************************/
package org.eclipse.swt.examples.controlexample;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ControlAdapter;
import org.eclipse.swt.events.ControlEvent;
import org.eclipse.swt.events.MouseAdapter;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Caret;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.ScrollBar;
import org.eclipse.swt.widgets.TabFolder;
import org.eclipse.swt.widgets.Text;
import org.eclipse.swt.widgets.Widget;
class CanvasTab extends Tab {
static final String canvasString = "Canvas"; //$NON-NLS-1$
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 };
/* Example widgets and groups that contain them */
Canvas canvas;
Group canvasGroup;
/* Other widgets added to the "Other" group */
Button caretButton, fillDamageButton;
int cx, cy;
/* Style widgets added to the "Style" group */
Button horizontalButton, verticalButton, noBackgroundButton, noFocusButton, noMergePaintsButton,
noRedrawResizeButton, doubleBufferedButton;
int maxX, maxY;
int paintCount;
/**
* Creates the Tab within a given instance of ControlExample.
*/
CanvasTab(ControlExample instance) {
super(instance);
}
/**
* 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(CanvasTab.colors[paintCount % CanvasTab.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(CanvasTab.canvasString);
gc.drawString(CanvasTab.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);
}
});
}
canvas.addMouseListener(new MouseAdapter() {
@Override
public void mouseDown(MouseEvent e) {
eventConsole.append("Clicked on Canvas: button=" + e.button + " x=" + e.x + " y=" + e.y + Text.DELIMITER);
}
@Override
public void mouseDoubleClick(MouseEvent e) {
eventConsole.append("Double-clicked on Canvas: button=" + e.button + " x=" + e.x + " y=" + e.y + Text.DELIMITER);
}
});
}
/**
* 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 "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();
}
}