org.eclipse.jface.action.StatusLine Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2000, 2018 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
* Lars Vogel - Bug 440270
* Jan-Ove Weichel - Bug 475879
*******************************************************************************/
package org.eclipse.jface.action;
import static org.eclipse.swt.events.SelectionListener.widgetSelectedAdapter;
import java.util.Objects;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jface.dialogs.ProgressIndicator;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.JFaceColors;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.util.Util;
import org.eclipse.swt.SWT;
import org.eclipse.swt.accessibility.ACC;
import org.eclipse.swt.accessibility.AccessibleControlAdapter;
import org.eclipse.swt.accessibility.AccessibleControlEvent;
import org.eclipse.swt.custom.CLabel;
import org.eclipse.swt.dnd.Clipboard;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.Image;
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.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Layout;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.swt.widgets.ToolBar;
import org.eclipse.swt.widgets.ToolItem;
/**
* A StatusLine control is a SWT Composite with a horizontal layout which hosts
* a number of status indication controls. Typically it is situated below the
* content area of the window.
*
* By default a StatusLine has two predefined status controls: a MessageLine and
* a ProgressIndicator and it provides API for easy access.
*
*
* This is an internal class, not intended to be used outside the JFace
* framework.
*
*/
/* package */class StatusLine extends Composite implements IProgressMonitor {
/** Horizontal gaps between items. */
public static final int GAP = 3;
/** Progress bar creation is delayed by this ms */
public static final int DELAY_PROGRESS = 500;
/** visibility state of the progressbar */
protected volatile boolean fProgressIsVisible = false;
/** visibility state of the cancle button */
protected boolean fCancelButtonIsVisible = false;
/** enablement state of the cancle button */
protected volatile boolean fCancelEnabled = false;
/** name of the task */
protected volatile String fTaskName;
/** is the task is cancled */
protected volatile boolean fIsCanceled;
/** the start time of the task */
protected volatile long fStartTime;
/** the message text */
protected volatile String fMessageText;
/** the message image */
protected volatile Image fMessageImage;
/** the error text */
protected String fErrorText;
/** the error image */
protected Image fErrorImage;
/** the message label */
protected CLabel fMessageLabel;
/** the composite parent of the progress bar */
protected Composite fProgressBarComposite;
/** the progress bar */
protected volatile ProgressIndicator fProgressBar;
/** the toolbar */
protected volatile ToolBar fToolBar;
/** the cancle button */
protected volatile ToolItem fCancelButton;
/** stop image descriptor */
protected static ImageDescriptor fgStopImage = ImageDescriptor
.createFromFile(StatusLine.class, "images/stop.png");//$NON-NLS-1$
private MenuItem copyMenuItem;
static {
JFaceResources.getImageRegistry().put(
"org.eclipse.jface.parts.StatusLine.stopImage", fgStopImage);//$NON-NLS-1$
}
/**
* Layout the contribution item controls on the status line.
*/
public class StatusLineLayout extends Layout {
private final StatusLineLayoutData DEFAULT_DATA = new StatusLineLayoutData();
@Override
public Point computeSize(Composite composite, int wHint, int hHint,
boolean changed) {
if (wHint != SWT.DEFAULT && hHint != SWT.DEFAULT) {
return new Point(wHint, hHint);
}
Control[] children = composite.getChildren();
int totalWidth = 0;
int maxHeight = 0;
int totalCnt = 0;
for (Control w : children) {
boolean useWidth = true;
if (w == fProgressBarComposite && !fProgressIsVisible) {
useWidth = false;
} else if (w == fToolBar && !fCancelButtonIsVisible) {
useWidth = false;
}
StatusLineLayoutData data = (StatusLineLayoutData) w
.getLayoutData();
if (data == null) {
data = DEFAULT_DATA;
}
Point e = w.computeSize(data.widthHint, data.heightHint,
changed);
if (useWidth) {
totalWidth += e.x;
totalCnt++;
}
maxHeight = Math.max(maxHeight, e.y);
}
if (totalCnt > 0) {
totalWidth += (totalCnt - 1) * GAP;
}
if (totalWidth <= 0) {
totalWidth = maxHeight * 4;
}
return new Point(totalWidth, maxHeight);
}
@Override
public void layout(Composite composite, boolean flushCache) {
if (composite == null) {
return;
}
// StatusLineManager skips over the standard status line widgets
// in its update method. There is thus a dependency
// between the layout of the standard widgets and the update method.
// Make sure cancel button and progress bar are before
// contributions.
fMessageLabel.moveAbove(null);
fToolBar.moveBelow(fMessageLabel);
fProgressBarComposite.moveBelow(fToolBar);
Rectangle rect = composite.getClientArea();
Control[] children = composite.getChildren();
int count = children.length;
int ws[] = new int[count];
int h = rect.height;
int totalWidth = -GAP;
for (int i = 0; i < count; i++) {
Control w = children[i];
if (w == fProgressBarComposite && !fProgressIsVisible) {
continue;
}
if (w == fToolBar && !fCancelButtonIsVisible) {
continue;
}
StatusLineLayoutData data = (StatusLineLayoutData) w
.getLayoutData();
if (data == null) {
data = DEFAULT_DATA;
}
int width = w.computeSize(data.widthHint, h, flushCache).x;
ws[i] = width;
totalWidth += width + GAP;
}
int diff = rect.width - totalWidth;
ws[0] += diff; // make the first StatusLabel wider
// Check against minimum recommended width
final int msgMinWidth = rect.width / 3;
if (ws[0] < msgMinWidth) {
diff = ws[0] - msgMinWidth;
ws[0] = msgMinWidth;
} else {
diff = 0;
}
// Take space away from the contributions first.
for (int i = count - 1; i >= 0 && diff < 0; --i) {
int min = Math.min(ws[i], -diff);
ws[i] -= min;
diff += min + GAP;
}
int x = rect.x;
int y = rect.y;
for (int i = 0; i < count; i++) {
Control w = children[i];
/*
* Workaround for Linux Motif: Even if the progress bar and
* cancel button are not set to be visible ad of width 0, they
* still draw over the first pixel of the editor contributions.
*
* The fix here is to draw the progress bar and cancel button
* off screen if they are not visible.
*/
if (w == fProgressBarComposite && !fProgressIsVisible
|| w == fToolBar && !fCancelButtonIsVisible) {
w.setBounds(x + rect.width, y, ws[i], h);
continue;
}
w.setBounds(x, y, ws[i], h);
if (ws[i] > 0) {
x += ws[i] + GAP;
}
}
}
}
/**
* Create a new StatusLine as a child of the given parent.
*
* @param parent
* the parent for this Composite
* @param style
* the style used to create this widget
*/
public StatusLine(Composite parent, int style) {
super(parent, style);
getAccessible().addAccessibleControlListener(new AccessibleControlAdapter() {
@Override
public void getRole(AccessibleControlEvent e) {
e.detail = ACC.ROLE_STATUSBAR;
}
});
addDisposeListener(e -> handleDispose());
// StatusLineManager skips over the standard status line widgets
// in its update method. There is thus a dependency
// between this code defining the creation and layout of the standard
// widgets and the update method.
setLayout(new StatusLineLayout());
fMessageLabel = new CLabel(this, SWT.NONE);// SWT.SHADOW_IN);
// this would need extra work to make this accessible
// from the workbench command framework.
Menu menu = new Menu(fMessageLabel);
fMessageLabel.setMenu(menu);
copyMenuItem = new MenuItem(menu, SWT.PUSH);
copyMenuItem.setText(JFaceResources.getString("copy")); //$NON-NLS-1$
copyMenuItem.addSelectionListener(widgetSelectedAdapter(e -> {
String text = fMessageLabel.getText();
if (text != null && text.length() > 0) {
text = LegacyActionTools.removeMnemonics(text);
Clipboard cp = new Clipboard(e.display);
cp.setContents(new Object[] { text },
new Transfer[] { TextTransfer.getInstance() });
cp.dispose();
}
}));
fProgressIsVisible = false;
fCancelEnabled = false;
fToolBar = new ToolBar(this, SWT.FLAT);
fCancelButton = new ToolItem(fToolBar, SWT.PUSH);
fCancelButton.setImage(fgStopImage.createImage());
fCancelButton.setToolTipText(JFaceResources
.getString("Cancel_Current_Operation")); //$NON-NLS-1$
fCancelButton.addSelectionListener(widgetSelectedAdapter(e -> setCanceled(true)));
fCancelButton.addDisposeListener(e -> {
Image i = fCancelButton.getImage();
if ((i != null) && (!i.isDisposed())) {
i.dispose();
}
});
// We create a composite to create the progress bar in
// so that it can be centered. See bug #32331
fProgressBarComposite = new Composite(this, SWT.NONE);
GridLayout layout = new GridLayout();
layout.horizontalSpacing = 0;
layout.verticalSpacing = 0;
layout.marginHeight = 0;
layout.marginWidth = 0;
fProgressBarComposite.setLayout(layout);
fProgressBar = new ProgressIndicator(fProgressBarComposite);
fProgressBar.setLayoutData(new GridData(GridData.GRAB_HORIZONTAL
| GridData.GRAB_VERTICAL));
}
/**
* Notifies that the main task is beginning.
*
* @param name
* the name (or description) of the main task
* @param totalWork
* the total number of work units into which the main task is
* been subdivided. If the value is 0 or UNKNOWN the
* implemenation is free to indicate progress in a way which
* doesn't require the total number of work units in advance. In
* general users should use the UNKNOWN value if they don't know
* the total amount of work units.
*/
@Override
public void beginTask(String name, int totalWork) {
final long timestamp = System.currentTimeMillis();
fStartTime = timestamp;
if (fProgressBar == null) {
return;
}
final boolean animated = (totalWork == UNKNOWN || totalWork == 0);
// make sure the progress bar is made visible while
// the task is running. Fixes bug 32198 for the non-animated case.
Runnable timer = () -> StatusLine.this.startTask(timestamp, animated);
inUIThread(() -> {
fProgressBar.getDisplay().timerExec(DELAY_PROGRESS, timer);
if (!animated) {
fProgressBar.beginTask(totalWork);
}
if (name == null) {
fTaskName = Util.ZERO_LENGTH_STRING;
} else {
fTaskName = name;
}
setMessage(fTaskName);
});
}
private void inUIThread(Runnable r) {
if (Display.getCurrent() != null) {
r.run();
} else {
getDisplay().asyncExec(() -> {
if (!isDisposed()) {
r.run();
}
});
}
}
/**
* Notifies that the work is done; that is, either the main task is
* completed or the user cancelled it. Done() can be called more than once;
* an implementation should be prepared to handle this case.
*/
@Override
public void done() {
fStartTime = 0;
inUIThread(() -> {
if (fProgressBar != null) {
fProgressBar.sendRemainingWork();
fProgressBar.done();
}
setMessage(null);
hideProgress();
});
}
/**
* Returns the status line's progress monitor
*
* @return {@link IProgressMonitor} the progress monitor
*/
public IProgressMonitor getProgressMonitor() {
return this;
}
/**
* @private
*/
protected void handleDispose() {
if (fProgressBar != null) {
fProgressBar.dispose();
fProgressBar = null;
}
}
/**
* Hides the Cancel button and ProgressIndicator.
*/
protected void hideProgress() {
if (fProgressIsVisible && !isDisposed()) {
fProgressIsVisible = false;
fCancelEnabled = false;
fCancelButtonIsVisible = false;
if (fToolBar != null && !fToolBar.isDisposed()) {
fToolBar.setVisible(false);
}
if (fProgressBarComposite != null
&& !fProgressBarComposite.isDisposed()) {
fProgressBarComposite.setVisible(false);
}
layout();
}
}
/**
* @see IProgressMonitor#internalWorked(double)
*/
@Override
public void internalWorked(double work) {
inUIThread(() -> {
if (!fProgressIsVisible) {
if (System.currentTimeMillis() - fStartTime > DELAY_PROGRESS) {
showProgress();
}
}
if (fProgressBar != null) {
fProgressBar.worked(work);
}
});
}
/**
* Returns true if the user does some UI action to cancel this operation.
* (like hitting the Cancel button on the progress dialog). The long running
* operation typically polls isCanceled().
*/
@Override
public boolean isCanceled() {
return fIsCanceled;
}
/**
* Returns
* true if the ProgressIndication provides UI for canceling
* a long running operation.
* @return true if the ProgressIndication provides UI for canceling
*/
public boolean isCancelEnabled() {
return fCancelEnabled;
}
/**
* Sets the cancel status. This method is usually called with the argument
* false if a client wants to abort a cancel action.
*/
@Override
public void setCanceled(boolean b) {
fIsCanceled = b;
if (fCancelButton != null) {
inUIThread(() -> {
fCancelButton.setEnabled(!b);
});
}
}
/**
* Controls whether the ProgressIndication provides UI for canceling a long
* running operation. If the ProgressIndication is currently visible calling
* this method may have a direct effect on the layout because it will make a
* cancel button visible.
*
* @param enabled true if cancel should be enabled
*/
public void setCancelEnabled(boolean enabled) {
fCancelEnabled = enabled;
if (fProgressIsVisible && !fCancelButtonIsVisible && enabled) {
showButton();
layout();
}
if (fCancelButton != null && !fCancelButton.isDisposed()) {
fCancelButton.setEnabled(enabled);
}
}
/**
* Sets the error message text to be displayed on the status line. The image
* on the status line is cleared.
*
* @param message
* the error message, or null for no error message
*/
public void setErrorMessage(String message) {
setErrorMessage(null, message);
}
/**
* Sets an image and error message text to be displayed on the status line.
*
* @param image
* the image to use, or null for no image
* @param message
* the error message, or null for no error message
*/
public void setErrorMessage(Image image, String message) {
fErrorText = trim(message);
fErrorImage = image;
updateMessageLabel();
}
/**
* Applies the given font to this status line.
*/
@Override
public void setFont(Font font) {
super.setFont(font);
Control[] children = getChildren();
for (Control element : children) {
element.setFont(font);
}
}
/**
* Sets the message text to be displayed on the status line. The image on
* the status line is cleared.
*
* @param message
* the error message, or null for no error message
*/
public void setMessage(String message) {
setMessage(null, message);
}
/**
* Sets an image and a message text to be displayed on the status line.
*
* @param image
* the image to use, or null for no image
* @param message
* the message, or null for no message
*/
public void setMessage(Image image, String message) {
fMessageText = trim(message);
fMessageImage = image;
inUIThread(this::updateMessageLabel);
}
/**
* @see IProgressMonitor#setTaskName(java.lang.String)
*/
@Override
public void setTaskName(String name) {
String s = (name == null) ? Util.ZERO_LENGTH_STRING : name;
boolean changed = !Objects.equals(fTaskName, s);
if (changed) {
fTaskName = s;
setMessage(s);
}
}
/**
* Makes the Cancel button visible.
*/
protected void showButton() {
if (fToolBar != null && !fToolBar.isDisposed()) {
fToolBar.setVisible(true);
fToolBar.setEnabled(true);
fToolBar.setCursor(getDisplay().getSystemCursor(SWT.CURSOR_ARROW));
fCancelButtonIsVisible = true;
}
}
/**
* Shows the Cancel button and ProgressIndicator.
*/
protected void showProgress() {
if (!fProgressIsVisible && !isDisposed()) {
fProgressIsVisible = true;
if (fCancelEnabled) {
showButton();
}
if (fProgressBarComposite != null
&& !fProgressBarComposite.isDisposed()) {
fProgressBarComposite.setVisible(true);
}
layout();
}
}
/**
* @private
*/
void startTask(final long timestamp, final boolean animated) {
if (!fProgressIsVisible && fStartTime == timestamp) {
inUIThread(() -> {
showProgress();
if (animated) {
if (fProgressBar != null && !fProgressBar.isDisposed()) {
fProgressBar.beginAnimatedTask();
}
}
});
}
}
/**
* Notifies that a subtask of the main task is beginning. Subtasks are
* optional; the main task might not have subtasks.
*
* @param name
* the name (or description) of the subtask
* @see IProgressMonitor#subTask(String)
*/
@Override
public void subTask(String name) {
String newName;
if (name == null)
newName = Util.ZERO_LENGTH_STRING;
else
newName = name;
String text;
if (fTaskName == null || fTaskName.isEmpty()) {
text = newName;
} else {
text = JFaceResources.format("Set_SubTask", fTaskName, newName);//$NON-NLS-1$
}
setMessage(text);
}
/**
* Trims the message to be displayable in the status line. This just pulls
* out the first line of the message. Allows null.
*/
String trim(String message) {
if (message == null) {
return null;
}
message = LegacyActionTools.escapeMnemonics(message);
int cr = message.indexOf('\r');
int lf = message.indexOf('\n');
if (cr == -1 && lf == -1) {
return message;
}
int len;
if (cr == -1) {
len = lf;
} else if (lf == -1) {
len = cr;
} else {
len = Math.min(cr, lf);
}
return message.substring(0, len);
}
/**
* Updates the message label widget.
*/
protected void updateMessageLabel() {
if (fMessageLabel != null && !fMessageLabel.isDisposed()) {
Display display = fMessageLabel.getDisplay();
if ((fErrorText != null && fErrorText.length() > 0)
|| fErrorImage != null) {
fMessageLabel.setForeground(JFaceColors.getErrorText(display));
fMessageLabel.setText(fErrorText);
fMessageLabel.setImage(fErrorImage);
} else {
fMessageLabel.setForeground(getForeground());
fMessageLabel.setText(fMessageText == null ? "" : fMessageText); //$NON-NLS-1$
fMessageLabel.setImage(fMessageImage);
}
if (copyMenuItem != null && !copyMenuItem.isDisposed()) {
String text = fMessageLabel.getText();
copyMenuItem.setEnabled(text != null && text.length() > 0);
}
}
}
/**
* @see IProgressMonitor#worked(int)
*/
@Override
public void worked(int work) {
internalWorked(work);
}
}