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OverviewView.java
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OverviewView.java
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package text.overview.views;
import java.lang.ref.WeakReference;
import org.eclipse.jface.text.JFaceTextUtil;
import org.eclipse.jface.window.DefaultToolTip;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CaretEvent;
import org.eclipse.swt.custom.CaretListener;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.custom.TextChangeListener;
import org.eclipse.swt.custom.TextChangedEvent;
import org.eclipse.swt.custom.TextChangingEvent;
import org.eclipse.swt.events.ControlAdapter;
import org.eclipse.swt.events.ControlEvent;
import org.eclipse.swt.events.ControlListener;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.MouseAdapter;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseTrackAdapter;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Cursor;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Scale;
import org.eclipse.swt.widgets.Scrollable;
import org.eclipse.ui.ISizeProvider;
import org.eclipse.ui.IViewLayout;
import org.eclipse.ui.part.ViewPart;
import text.overview.Activator;
/**
* This implements a view that shows the overview of last focused StyledText in
* the parent workbench windows
*
* @author Sandip Chitale
*/
public class OverviewView extends ViewPart implements IViewLayout, ISizeProvider {
/**
* The ID of the view as specified by the extension.
*/
public static final String ID = "text.overview.views.OverviewView";
private StyledText overviewStyledText;
private Cursor overviewStyledTextCrosshairCursor;
private DefaultToolTip overviewStyledTextToolTip;
private StyledText lastOverviewedStyledText;
private Font lastFont;
private String lastFontName;
private int lastFontStyle;
private double lastScale = 0.2d;
private int lastTopIndex = -1;
private int lastLineAtOffset = -1;
private Listener focusListenerFilter;
private ControlListener parentResizeListener;
private TextChangeListener lastOverviewedStyledTextTextChangeListener;
private CaretListener lastOverviewedStyledTextCaretListener;
private SelectionListener lastOverviewedStyledTextScrollBarSelectionListener;
private ControlListener lastOverviewedStyledTextResizeListener;
private DisposeListener lastOverviewedStyledTextDisposeListener;
private final ThreadLocal<Boolean> suspendLastOverviewedStyledText = new ThreadLocal<Boolean>();
private Scale scale;
/**
* The constructor.
*/
public OverviewView() {
}
/**
* This is a callback that will allow us to create the viewer and initialize
* it.
*/
public void createPartControl(Composite parent) {
final Display display = parent.getDisplay();
Composite container = new Composite(parent, SWT.NONE);
container.setLayout(new org.eclipse.swt.layout.GridLayout(1, true));
final Composite composite = new Composite(container, SWT.NONE);
composite.setLayout(null);
composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
lastOverviewedStyledTextTextChangeListener = new TextChangeListener() {
@Override
public void textSet(TextChangedEvent event) {
}
@Override
public void textChanging(TextChangingEvent event) {
blank();
}
@Override
public void textChanged(TextChangedEvent event) {
blank();
}
};
// listener to monitor if the carent movement changed the
// lines visible in the tracked StyledText due to scrolling
lastOverviewedStyledTextCaretListener = new CaretListener() {
@Override
public void caretMoved(CaretEvent event) {
if (suspendLastOverviewedStyledText.get() != null) {
return;
}
int topIndex = -1;
int lineAtOffset = -1;
try {
if (lastOverviewedStyledText != null) {
topIndex = lastOverviewedStyledText.getTopIndex();
int caretOffset = lastOverviewedStyledText.getCaretOffset();
lineAtOffset = lastOverviewedStyledText.getLineAtOffset(caretOffset);
if (topIndex != lastTopIndex || lineAtOffset != lastLineAtOffset) {
highlightViewport(topIndex != lastTopIndex);
}
}
} finally {
lastTopIndex = topIndex;
lastLineAtOffset = lineAtOffset;
}
}
};
lastOverviewedStyledTextScrollBarSelectionListener = new SelectionAdapter() {
@Override
public void widgetDefaultSelected(SelectionEvent e) {
widgetSelected(e);
}
@Override
public void widgetSelected(SelectionEvent event) {
if (suspendLastOverviewedStyledText.get() != null) {
return;
}
int topIndex = -1;
int lineAtOffset = -1;
try {
if (lastOverviewedStyledText != null) {
topIndex = lastOverviewedStyledText.getTopIndex();
int caretOffset = lastOverviewedStyledText.getCaretOffset();
lineAtOffset = lastOverviewedStyledText.getLineAtOffset(caretOffset);
if (topIndex != lastTopIndex || lineAtOffset != lastLineAtOffset) {
highlightViewport(topIndex != lastTopIndex);
}
}
} finally {
lastTopIndex = topIndex;
lastLineAtOffset = lineAtOffset;
}
}
};
lastOverviewedStyledTextResizeListener = new ControlAdapter() {
@Override
public void controlResized(ControlEvent e) {
adjustSize();
}
};
// listener for dispose of tracked StyledText
lastOverviewedStyledTextDisposeListener = new DisposeListener() {
@Override
public void widgetDisposed(DisposeEvent e) {
blank();
}
};
focusListenerFilter = new Listener() {
@Override
public void handleEvent(final Event event) {
OverviewView.this.handleEvent(event);
}
};
display.syncExec(new Runnable() {
@Override
public void run() {
// Track focus
display.addFilter(SWT.FocusIn, focusListenerFilter);
}
});
scale = new Scale(container, SWT.BORDER);
scale.setMinimum(Activator.getDefault().getMinOverviewFontSize());
scale.setSelection(Activator.getDefault().getOverviewFontSize());
scale.setMaximum(Activator.getDefault().getMaxOverviewFontSize());
scale.setIncrement(1);
scale.setPageIncrement(1);
scale.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
scale.addSelectionListener(new SelectionListener() {
@Override
public void widgetSelected(SelectionEvent e) {
Activator.getDefault().setOverviewFontSize(scale.getSelection());
StyledText styledText = lastOverviewedStyledText;
blank();
lastFontName = null;
lastFontStyle = 0;
reconfigureOverviewStyledText(composite);
lastOverviewedStyledText = null;
trackStyledText(styledText);
}
@Override
public void widgetDefaultSelected(SelectionEvent e) {
widgetSelected(e);
}
});
reconfigureOverviewStyledText(composite);
}
private void reconfigureOverviewStyledText(Composite composite) {
final Display display = composite.getDisplay();
boolean layout = false;
if (overviewStyledText != null) {
overviewStyledTextToolTip.hide();
overviewStyledText.setToolTipText(null);
removeListenersLastOverviewedStyledText();
overviewStyledTextCrosshairCursor.dispose();
overviewStyledText.dispose();
layout = true;
}
overviewStyledText = new StyledText(composite, SWT.MULTI | SWT.READ_ONLY | SWT.V_SCROLL | SWT.H_SCROLL);
overviewStyledText.setEditable(false);
overviewStyledTextCrosshairCursor = new Cursor(display, SWT.CURSOR_CROSS);
overviewStyledText.setCursor(overviewStyledTextCrosshairCursor);
overviewStyledTextToolTip = new DefaultToolTip(overviewStyledText, DefaultToolTip.RECREATE, true);
overviewStyledText.addMouseListener(new MouseAdapter() {
@Override
public void mouseDoubleClick(MouseEvent e) {
if (lastOverviewedStyledText != null) {
overviewStyledTextToolTip.hide();
lastOverviewedStyledText.setFocus();
}
}
});
overviewStyledText.addMouseTrackListener(new MouseTrackAdapter() {
@Override
public void mouseHover(MouseEvent e) {
int lineIndex = overviewStyledText.getLineIndex(e.y);
int fromLine = Math.max(0, lineIndex - 2);
int toLine = Math.min(overviewStyledText.getLineCount() - 1, lineIndex + 2);
int width = (int)(Math.log10(toLine+1) + 2);
StringBuilder tooltip = new StringBuilder();
for (int i = fromLine; i <= toLine; i++) {
if (i > fromLine) {
tooltip.append("\n");
}
tooltip.append(String.format("%" + width + "d ", i+1));
String line = overviewStyledText.getLine(i);
if (line != null) {
tooltip.append((i == lineIndex ? "\u00bb\t" : " \t") +
line.substring(0, Math.min(line.length(), 80)));
}
}
overviewStyledTextToolTip.setText(tooltip.toString());
overviewStyledTextToolTip.setPopupDelay(500);
overviewStyledTextToolTip.setHideDelay(3000);
overviewStyledTextToolTip.show(new Point(0, e.y + 10));
}
@Override
public void mouseExit(MouseEvent e) {
overviewStyledTextToolTip.setText(null);
}
});
overviewStyledText.addCaretListener(new CaretListener() {
@Override
public void caretMoved(CaretEvent event) {
if (suspendLastOverviewedStyledText.get() != null) {
return;
}
adjustTrackedStyledText();
}
});
parentResizeListener = new ControlAdapter() {
@Override
public void controlResized(ControlEvent e) {
adjustSize();
}
};
overviewStyledText.getParent().addControlListener(parentResizeListener);
display.syncExec(new Runnable() {
@Override
public void run() {
// Check if there is focused StyledText
// in this workbench window, if so track it
Control focusControl = display.getFocusControl();
if (focusControl instanceof StyledText) {
StyledText styledText = (StyledText) focusControl;
if (styledText.getShell() == overviewStyledText.getShell()) {
trackStyledText(styledText);
}
}
}
});
if (layout) {
composite.layout(true);
}
}
private WeakReference<StyledText> lastNonOverviewStyledText = null;
void refreshOverviewView() {
if (lastNonOverviewStyledText != null) {
StyledText st = lastNonOverviewStyledText.get();
if (st == null || st.isDisposed()) {
lastNonOverviewStyledText = null;
return;
}
trackStyledText(st);
}
}
protected void handleEvent(Event event) {
if (event.type == SWT.FocusIn) {
if (event.widget instanceof StyledText) {
StyledText styledText = (StyledText) event.widget;
if (styledText.isDisposed()) {
return;
}
if (styledText == overviewStyledText) {
refreshOverviewView();
return;
}
if (styledText.getShell() != overviewStyledText.getShell()) {
return;
}
lastNonOverviewStyledText = new WeakReference<StyledText>(styledText);
trackStyledText(styledText);
}
}
}
@Override
public void dispose() {
overviewStyledTextCrosshairCursor.dispose();
getViewSite().getWorkbenchWindow().getShell().getDisplay().removeFilter(SWT.FocusIn, focusListenerFilter);
removeListenersLastOverviewedStyledText();
lastOverviewedStyledText = null;
lastFont.dispose();
lastFont = null;
lastFontName = null;
focusListenerFilter = null;
super.dispose();
}
private void trackStyledText(StyledText styledText) {
if (lastOverviewedStyledText == styledText) {
return;
}
removeListenersLastOverviewedStyledText();
try {
suspendLastOverviewedStyledText.set(Boolean.TRUE);
lastOverviewedStyledText = styledText;
addListenersLastOverviewedStyledText();
Font font = lastOverviewedStyledText.getFont();
FontData[] fontData = font.getFontData();
FontData fontDatum = fontData[0];
if (fontDatum.getName().equals(lastFontName) && fontDatum.getStyle() == lastFontStyle) {
// nothing to do
} else {
lastFontName = fontDatum.getName();
lastFontStyle = fontDatum.getStyle();
if (lastFont != null) {
lastFont.dispose();
}
lastFont = new Font(overviewStyledText.getDisplay(), lastFontName, Activator.getDefault().getOverviewFontSize(), lastFontStyle);
lastScale = ((double) Activator.getDefault().getOverviewFontSize()) / ((double) fontDatum.getHeight());
overviewStyledText.setFont(lastFont);
overviewStyledTextToolTip.setFont(font);
}
overviewStyledText.setForeground(lastOverviewedStyledText.getForeground());
overviewStyledText.setBackground(lastOverviewedStyledText.getBackground());
overviewStyledTextToolTip.setForegroundColor(lastOverviewedStyledText.getForeground());
overviewStyledTextToolTip.setBackgroundColor(lastOverviewedStyledText.getBackground());
overviewStyledText.setSelectionForeground(lastOverviewedStyledText.getSelectionForeground());
overviewStyledText.setSelectionBackground(lastOverviewedStyledText.getSelectionBackground());
overviewStyledText.setText(lastOverviewedStyledText.getText());
overviewStyledText.setStyleRanges(lastOverviewedStyledText.getStyleRanges());
overviewStyledText.setSelection(lastOverviewedStyledText.getSelection());
scale.setToolTipText("Overview font size: " + Activator.getDefault().getOverviewFontSize());
adjustSize();
highlightViewport(true);
} finally {
suspendLastOverviewedStyledText.set(null);
}
}
private void removeListenersLastOverviewedStyledText() {
if (lastOverviewedStyledText != null) {
lastOverviewedStyledText.getContent().removeTextChangeListener(lastOverviewedStyledTextTextChangeListener);
lastOverviewedStyledText.removeCaretListener(lastOverviewedStyledTextCaretListener);
lastOverviewedStyledText.removeControlListener(lastOverviewedStyledTextResizeListener);
lastOverviewedStyledText.removeDisposeListener(lastOverviewedStyledTextDisposeListener);
((Scrollable) lastOverviewedStyledText).getVerticalBar().removeSelectionListener(lastOverviewedStyledTextScrollBarSelectionListener);
}
}
private void addListenersLastOverviewedStyledText() {
if (lastOverviewedStyledText != null) {
lastOverviewedStyledText.getContent().addTextChangeListener(lastOverviewedStyledTextTextChangeListener);
lastOverviewedStyledText.addCaretListener(lastOverviewedStyledTextCaretListener);
lastOverviewedStyledText.addControlListener(lastOverviewedStyledTextResizeListener);
lastOverviewedStyledText.addDisposeListener(lastOverviewedStyledTextDisposeListener);
((Scrollable) lastOverviewedStyledText).getVerticalBar().addSelectionListener(lastOverviewedStyledTextScrollBarSelectionListener);
}
}
private void blank() {
removeListenersLastOverviewedStyledText();
lastOverviewedStyledText = null;
lastTopIndex = -1;
lastLineAtOffset = -1;
overviewStyledText.setForeground(null);
overviewStyledText.setBackground(null);
overviewStyledTextToolTip.setForegroundColor(null);
overviewStyledTextToolTip.setBackgroundColor(null);
overviewStyledText.setSelectionForeground(null);
overviewStyledText.setSelectionBackground(null);
overviewStyledText.setText("");
overviewStyledText.setStyleRanges(new StyleRange[0]);
adjustSize();
unhighlightViewport();
}
private void adjustSize() {
Point size = overviewStyledText.computeSize(SWT.DEFAULT, SWT.DEFAULT);
int x = (int) (size.x * lastScale);
Point parentSize = overviewStyledText.getParent().getSize();
overviewStyledText.setSize(new Point(Math.max(parentSize.x, x), parentSize.y));
}
private void unhighlightViewport() {
overviewStyledText.setLineBackground(0, overviewStyledText.getLineCount() - 1, null);
}
private void highlightViewport(boolean topIndexChanged) {
if (topIndexChanged) {
unhighlightViewport();
}
if (lastOverviewedStyledText != null) {
// The index of the first (possibly only partially) visible line of
// the widget
int topIndex = JFaceTextUtil.getPartialTopIndex((StyledText) lastOverviewedStyledText);
// The index of the last (possibly only partially) visible line of
// the widget
int bottomIndex = JFaceTextUtil.getPartialBottomIndex((StyledText) lastOverviewedStyledText);
int caretOffset = lastOverviewedStyledText.getCaretOffset();
int lineAtOffset = lastOverviewedStyledText.getLineAtOffset(caretOffset);
overviewStyledText.setLineBackground(topIndex, (bottomIndex - topIndex) +
(bottomIndex >= (overviewStyledText.getLineCount() - 1)? 0 : 1),
overviewStyledText.getSelectionBackground());
overviewStyledText.setLineBackground(lineAtOffset, 1, null);
if (suspendLastOverviewedStyledText.get() == null) {
if (topIndex == 0) {
overviewStyledText.setTopIndex(topIndex);
} else {
overviewStyledText.setTopIndex(Math.max(0, topIndex - 1));
}
}
}
}
private void adjustTrackedStyledText() {
if (lastOverviewedStyledText != null) {
try {
suspendLastOverviewedStyledText.set(Boolean.TRUE);
int topIndex = JFaceTextUtil.getPartialTopIndex((StyledText) lastOverviewedStyledText);
// The index of the last (possibly only partially) visible line of
// the widget
int bottomIndex = JFaceTextUtil.getPartialBottomIndex((StyledText) lastOverviewedStyledText);
int visibleLinesCount = bottomIndex - topIndex;
int caretOffset = overviewStyledText.getCaretOffset();
int lineAtOffset = overviewStyledText.getLineAtOffset(caretOffset);
lastOverviewedStyledText.setTopIndex(Math.max(0, (lineAtOffset - (visibleLinesCount/2))));
lastOverviewedStyledText.setCaretOffset(caretOffset);
highlightViewport(true);
} finally {
suspendLastOverviewedStyledText.set(null);
}
}
}
/**
* Passing the focus request to the viewer's control.
*/
public void setFocus() {
overviewStyledText.setFocus();
}
@Override
public int getSizeFlags(boolean width) {
if (!width) {
return SWT.MIN | SWT.MAX;
}
return 0;
}
@Override
public int computePreferredSize(boolean width, int availableParallel, int availablePerpendicular,
int preferredResult) {
if (width) {
return 140;
}
return 0;
}
@Override
public boolean isCloseable() {
return true;
}
@Override
public void setCloseable(boolean closeable) {
}
@Override
public boolean isMoveable() {
return true;
}
@Override
public void setMoveable(boolean moveable) {
}
@Override
public boolean isStandalone() {
return true;
}
@Override
public boolean getShowTitle() {
return true;
}
}