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/*******************************************************************************
* Copyright (c) 2009, 2016 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.snippets;
/*
* StyledText: Variable tab stops
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*
*/
import org.eclipse.swt.*;
import org.eclipse.swt.custom.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class Snippet325 {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("Snippet 325");
shell.setLayout(new GridLayout());
shell.setText("StyledText: Variable tab stops");
Ruler ruler = new Ruler(shell, SWT.NONE);
GridData data = new GridData();
data.heightHint = 10;
data.horizontalAlignment = SWT.FILL;
ruler.setLayoutData(data);
ruler.setBackground(display.getSystemColor(SWT.COLOR_INFO_BACKGROUND));
StyledText styledText = new StyledText (shell, SWT.FULL_SELECTION | SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
styledText.setText("0\t1\t2\t3\t4\nDrag\tthe\ttab\tmarks\ton\ttop\tto\tchange\tthe\tposition\tof\tthe\ttab\tstops");
styledText.setTabStops(new int[] {30, 70, 90, 140});
styledText.setLayoutData(new GridData(GridData.FILL_BOTH));
ruler.setEditor(styledText);
shell.setSize(800, 400);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) display.sleep();
}
display.dispose ();
}
public static class Ruler extends Canvas {
StyledText styledText;
int hover = -1;
public Ruler (Composite parent, int style) {
super(parent, style | SWT.DOUBLE_BUFFERED);
Display display = getDisplay();
setBackground(display.getSystemColor(SWT.COLOR_INFO_BACKGROUND));
Listener listener = e -> {
switch (e.type) {
case SWT.Paint:
handlePaint(e);
break;
case SWT.MouseMove:
if ((e.stateMask & SWT.BUTTON1) != 0) {
handleDragMark(e);
} else {
handleMouseMove(e);
}
break;
case SWT.MouseExit:
if (hover != -1) redraw();
hover = -1;
break;
}
};
addListener(SWT.Paint, listener);
addListener(SWT.MouseMove, listener);
addListener(SWT.MouseExit, listener);
}
public void setEditor(StyledText editor) {
styledText = editor;
}
void handleMouseMove(Event e) {
int [] tabs = styledText.getTabStops();
int margin = styledText.getLeftMargin() + styledText.getBorderWidth();
int count = tabs.length;
int newIndex = -1;
int x = margin;
if (x <= e.x && e.x < x + 5) {
newIndex = 0;
}
int i = 0;
if (newIndex == -1) {
for (i = 0; i < count; i++) {
x = tabs[i] + margin;
if (x <= e.x && e.x <= x +5) {
newIndex = i + 1;
break;
}
}
}
if (newIndex == -1) {
int lastTabWidth = count > 1 ? tabs[count-1] - tabs[count-2] : tabs[0];
x += lastTabWidth;
Rectangle ca = getClientArea();
while (x < ca.x + ca.width) {
if (x <= e.x && e.x <= x +5) {
newIndex = i + 1;
break;
}
x += lastTabWidth;
i++;
}
}
if (newIndex != hover) {
hover = newIndex;
redraw();
}
}
void handleDragMark (Event e) {
if (hover <= 0) return;
int [] tabs = styledText.getTabStops();
int margin = styledText.getLeftMargin() + styledText.getBorderWidth();
int count = tabs.length;
int x = e.x - margin;
int index = hover - 1;
if (index < count) {
if (index >= count - 2) {
int last = tabs[count - 1];
int secondLast = tabs[count - 2];
int grow = index == count -1 ? 2 : 1;
int[] newTabs = new int[count + grow];
System.arraycopy(tabs, 0, newTabs, 0, count);
newTabs[count] = last + (last - secondLast);
if (grow == 2) {
newTabs[count + 1] = last + 2 * (last - secondLast);
}
tabs = newTabs;
}
} else {
int[] newTabs = new int[index + 3];
System.arraycopy(tabs, 0, newTabs, 0, count);
int last = tabs[count - 1];
int diff = last - tabs[count - 2];
for (int i = count; i < newTabs.length; i++) {
newTabs[i] = last + diff;
last += diff;
}
tabs = newTabs;
}
int min = index > 0 ? tabs [index - 1] + 1 : 0;
if (x < min) x = min;
int max = tabs[index + 1] - 1;
if (x > max) {
int diff = x - tabs[index];
for (int i = index + 1; i < count; i++) {
tabs[i] += diff;
}
}
tabs[index] = x;
styledText.setTabStops(tabs);
redraw();
}
void handlePaint(Event e) {
Display display = e.display;
GC gc = e.gc;
int [] tabs = styledText.getTabStops();
int margin = styledText.getLeftMargin() + styledText.getBorderWidth();
int x = margin;
gc.setBackground(display.getSystemColor(hover == 0 ? SWT.COLOR_RED : SWT.COLOR_BLACK));
gc.fillPolygon(new int[] {x,0, x+5,0, x, 10});
int i;
for (i = 0; i < tabs.length; i++) {
x = tabs[i] + margin;
if (x > e.x + e.width) break;
gc.setBackground(display.getSystemColor(hover == i + 1 ? SWT.COLOR_RED : SWT.COLOR_BLACK));
gc.fillPolygon(new int[] {x,0, x+5,0, x, 10});
}
int lastTabWidth = tabs.length > 1 ? tabs[tabs.length-1] - tabs[tabs.length-2] : tabs[0];
x += lastTabWidth;
while (x < e.x + e.width) {
gc.setBackground(display.getSystemColor(hover == ++i ? SWT.COLOR_RED : SWT.COLOR_BLACK));
gc.fillPolygon(new int[] {x,0, x+5,0, x, 10});
x += lastTabWidth;
}
}
}
}
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