/*******************************************************************************
* Copyright (c) 2000, 2010 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.jdt.internal.ui.text.java.hover;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.FocusListener;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.events.KeyListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.RGB;
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.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.preference.PreferenceConverter;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.text.Document;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IInformationControl;
import org.eclipse.jface.text.IInformationControlCreator;
import org.eclipse.jface.text.IInformationControlExtension;
import org.eclipse.jface.text.IInformationControlExtension3;
import org.eclipse.jface.text.IInformationControlExtension5;
import org.eclipse.jface.text.source.ISourceViewer;
import org.eclipse.jface.text.source.SourceViewer;
import org.eclipse.jdt.ui.JavaUI;
import org.eclipse.jdt.ui.PreferenceConstants;
import org.eclipse.jdt.ui.text.IJavaColorConstants;
import org.eclipse.jdt.ui.text.IJavaPartitions;
import org.eclipse.jdt.internal.ui.JavaPlugin;
import org.eclipse.jdt.internal.ui.javaeditor.JavaSourceViewer;
import org.eclipse.jdt.internal.ui.text.SimpleJavaSourceViewerConfiguration;
/**
* Source viewer based implementation of <code>IInformationControl</code>.
* Displays information in a source viewer.
*
* @since 3.0
*/
public class SourceViewerInformationControl implements IInformationControl, IInformationControlExtension, IInformationControlExtension3, IInformationControlExtension5, DisposeListener {
/** The control's shell */
private Shell fShell;
/** The control's text widget */
private StyledText fText;
/** The text font (do not dispose!) */
private Font fTextFont;
/** The control's source viewer */
private SourceViewer fViewer;
/**
* The optional status field.
*
* @since 3.0
*/
private Label fStatusField;
/**
* The separator for the optional status field.
*
* @since 3.0
*/
private Label fSeparator;
/**
* The font of the optional status text label.
*
* @since 3.0
*/
private Font fStatusTextFont;
/**
* The color of the optional status text label or <code>null</code> if none.
*
* @since 3.6
*/
private Color fStatusTextForegroundColor;
/**
* The width size constraint.
* @since 3.2
*/
private int fMaxWidth= SWT.DEFAULT;
/**
* The height size constraint.
* @since 3.2
*/
private int fMaxHeight= SWT.DEFAULT;
/**
* The orientation of the shell
* @since 3.4
*/
private final int fOrientation;
private Color fBackgroundColor;
private boolean fIsSystemBackgroundColor= true;
/**
* Creates a source viewer information control with the given shell as parent. The given
* styles are applied to the created styled text widget. The status field will
* contain the given text or be hidden.
*
* @param parent the parent shell
* @param isResizable <code>true</code> if resizable
* @param orientation the orientation
* @param statusFieldText the text to be used in the optional status field
* or <code>null</code> if the status field should be hidden
*/
public SourceViewerInformationControl(Shell parent, boolean isResizable, int orientation, String statusFieldText) {
Assert.isLegal(orientation == SWT.RIGHT_TO_LEFT || orientation == SWT.LEFT_TO_RIGHT || orientation == SWT.NONE);
fOrientation= orientation;
GridLayout layout;
GridData gd;
int shellStyle= SWT.TOOL | SWT.ON_TOP | orientation | (isResizable ? SWT.RESIZE : 0);
int textStyle= isResizable ? SWT.V_SCROLL | SWT.H_SCROLL : SWT.NONE;
fShell= new Shell(parent, SWT.NO_FOCUS | SWT.ON_TOP | shellStyle);
Display display= fShell.getDisplay();
initializeColors();
Composite composite= fShell;
layout= new GridLayout(1, false);
layout.marginHeight= 0;
layout.marginWidth= 0;
composite.setLayout(layout);
gd= new GridData(GridData.FILL_HORIZONTAL);
composite.setLayoutData(gd);
if (statusFieldText != null) {
composite= new Composite(composite, SWT.NONE);
layout= new GridLayout(1, false);
layout.marginHeight= 0;
layout.marginWidth= 0;
layout.verticalSpacing= 1;
composite.setLayout(layout);
gd= new GridData(GridData.FILL_BOTH);
composite.setLayoutData(gd);
composite.setForeground(display.getSystemColor(SWT.COLOR_INFO_FOREGROUND));
composite.setBackground(fBackgroundColor);
}
// Source viewer
IPreferenceStore store= JavaPlugin.getDefault().getCombinedPreferenceStore();
fViewer= new JavaSourceViewer(composite, null, null, false, textStyle, store);
fViewer.configure(new SimpleJavaSourceViewerConfiguration(JavaPlugin.getDefault().getJavaTextTools().getColorManager(), store, null, IJavaPartitions.JAVA_PARTITIONING, false));
fViewer.setEditable(false);
fText= fViewer.getTextWidget();
gd= new GridData(GridData.BEGINNING | GridData.FILL_BOTH);
fText.setLayoutData(gd);
fText.setForeground(display.getSystemColor(SWT.COLOR_INFO_FOREGROUND));
fText.setBackground(fBackgroundColor);
initializeFont();
fText.addKeyListener(new KeyListener() {
public void keyPressed(KeyEvent e) {
if (e.character == 0x1B) // ESC
fShell.dispose();
}
public void keyReleased(KeyEvent e) {}
});
// Status field
if (statusFieldText != null) {
// Horizontal separator line
fSeparator= new Label(composite, SWT.SEPARATOR | SWT.HORIZONTAL | SWT.LINE_DOT);
fSeparator.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
// Status field label
fStatusField= new Label(composite, SWT.RIGHT);
fStatusField.setText(statusFieldText);
Font font= fStatusField.getFont();
FontData[] fontDatas= font.getFontData();
for (int i= 0; i < fontDatas.length; i++)
fontDatas[i].setHeight(fontDatas[i].getHeight() * 9 / 10);
fStatusTextFont= new Font(fStatusField.getDisplay(), fontDatas);
fStatusField.setFont(fStatusTextFont);
GridData gd2= new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_BEGINNING);
fStatusField.setLayoutData(gd2);
RGB javaDefaultColor= JavaUI.getColorManager().getColor(IJavaColorConstants.JAVA_DEFAULT).getRGB();
fStatusTextForegroundColor= new Color(fStatusField.getDisplay(), blend(fBackgroundColor.getRGB(), javaDefaultColor, 0.56f));
fStatusField.setForeground(fStatusTextForegroundColor);
fStatusField.setBackground(fBackgroundColor);
}
addDisposeListener(this);
}
/**
* Returns an RGB that lies between the given foreground and background
* colors using the given mixing factor. A <code>factor</code> of 1.0 will produce a
* color equal to <code>fg</code>, while a <code>factor</code> of 0.0 will produce one
* equal to <code>bg</code>.
* @param bg the background color
* @param fg the foreground color
* @param factor the mixing factor, must be in [0, 1]
*
* @return the interpolated color
* @since 3.6
*/
private static RGB blend(RGB bg, RGB fg, float factor) {
// copy of org.eclipse.jface.internal.text.revisions.Colors#blend(..)
Assert.isLegal(bg != null);
Assert.isLegal(fg != null);
Assert.isLegal(factor >= 0f && factor <= 1f);
float complement= 1f - factor;
return new RGB(
(int) (complement * bg.red + factor * fg.red),
(int) (complement * bg.green + factor * fg.green),
(int) (complement * bg.blue + factor * fg.blue)
);
}
private void initializeColors() {
RGB bgRGB= getHoverBackgroundColorRGB();
if (bgRGB != null) {
fBackgroundColor= new Color(fShell.getDisplay(), bgRGB);
fIsSystemBackgroundColor= false;
} else {
fBackgroundColor= fShell.getDisplay().getSystemColor(SWT.COLOR_INFO_BACKGROUND);
fIsSystemBackgroundColor= true;
}
}
private RGB getHoverBackgroundColorRGB() {
IPreferenceStore store= JavaPlugin.getDefault().getPreferenceStore();
return store.getBoolean(PreferenceConstants.EDITOR_SOURCE_HOVER_BACKGROUND_COLOR_SYSTEM_DEFAULT)
? null
: PreferenceConverter.getColor(store, PreferenceConstants.EDITOR_SOURCE_HOVER_BACKGROUND_COLOR);
}
/**
* Initialize the font to the Java editor font.
*
* @since 3.2
*/
private void initializeFont() {
fTextFont= JFaceResources.getFont(PreferenceConstants.EDITOR_TEXT_FONT);
StyledText styledText= getViewer().getTextWidget();
styledText.setFont(fTextFont);
}
/*
* @see org.eclipse.jface.text.IInformationControlExtension2#setInput(java.lang.Object)
*/
public void setInput(Object input) {
if (input instanceof String)
setInformation((String)input);
else
setInformation(null);
}
/*
* @see IInformationControl#setInformation(String)
*/
public void setInformation(String content) {
if (content == null) {
fViewer.setInput(null);
return;
}
IDocument doc= new Document(content);
JavaPlugin.getDefault().getJavaTextTools().setupJavaDocumentPartitioner(doc, IJavaPartitions.JAVA_PARTITIONING);
fViewer.setInput(doc);
}
/*
* @see IInformationControl#setVisible(boolean)
*/
public void setVisible(boolean visible) {
fShell.setVisible(visible);
}
/**
* {@inheritDoc}
* @since 3.0
*/
public void widgetDisposed(DisposeEvent event) {
if (fStatusTextFont != null && !fStatusTextFont.isDisposed())
fStatusTextFont.dispose();
fStatusTextFont= null;
if (fStatusTextForegroundColor != null && !fStatusTextForegroundColor.isDisposed())
fStatusTextForegroundColor.dispose();
fStatusTextForegroundColor= null;
fTextFont= null;
fShell= null;
fText= null;
}
/**
* {@inheritDoc}
*/
public final void dispose() {
if (!fIsSystemBackgroundColor)
fBackgroundColor.dispose();
if (fShell != null && !fShell.isDisposed())
fShell.dispose();
else
widgetDisposed(null);
}
/*
* @see IInformationControl#setSize(int, int)
*/
public void setSize(int width, int height) {
fShell.setSize(width, height);
}
/*
* @see IInformationControl#setLocation(Point)
*/
public void setLocation(Point location) {
fShell.setLocation(location);
}
/*
* @see IInformationControl#setSizeConstraints(int, int)
*/
public void setSizeConstraints(int maxWidth, int maxHeight) {
fMaxWidth= maxWidth;
fMaxHeight= maxHeight;
}
/*
* @see IInformationControl#computeSizeHint()
*/
public Point computeSizeHint() {
// compute the preferred size
int x= SWT.DEFAULT;
int y= SWT.DEFAULT;
Point size= fShell.computeSize(x, y);
if (size.x > fMaxWidth)
x= fMaxWidth;
if (size.y > fMaxHeight)
y= fMaxHeight;
// recompute using the constraints if the preferred size is larger than the constraints
if (x != SWT.DEFAULT || y != SWT.DEFAULT)
size= fShell.computeSize(x, y, false);
return size;
}
/*
* @see IInformationControl#addDisposeListener(DisposeListener)
*/
public void addDisposeListener(DisposeListener listener) {
fShell.addDisposeListener(listener);
}
/*
* @see IInformationControl#removeDisposeListener(DisposeListener)
*/
public void removeDisposeListener(DisposeListener listener) {
fShell.removeDisposeListener(listener);
}
/*
* @see IInformationControl#setForegroundColor(Color)
*/
public void setForegroundColor(Color foreground) {
fText.setForeground(foreground);
}
/*
* @see IInformationControl#setBackgroundColor(Color)
*/
public void setBackgroundColor(Color background) {
fText.setBackground(background);
}
/*
* @see IInformationControl#isFocusControl()
*/
public boolean isFocusControl() {
return fShell.getDisplay().getActiveShell() == fShell;
}
/*
* @see IInformationControl#setFocus()
*/
public void setFocus() {
fShell.forceFocus();
fText.setFocus();
}
/*
* @see IInformationControl#addFocusListener(FocusListener)
*/
public void addFocusListener(FocusListener listener) {
fText.addFocusListener(listener);
}
/*
* @see IInformationControl#removeFocusListener(FocusListener)
*/
public void removeFocusListener(FocusListener listener) {
fText.removeFocusListener(listener);
}
/*
* @see IInformationControlExtension#hasContents()
*/
public boolean hasContents() {
return fText.getCharCount() > 0;
}
protected ISourceViewer getViewer() {
return fViewer;
}
/*
* @see org.eclipse.jface.text.IInformationControlExtension3#computeTrim()
* @since 3.4
*/
public Rectangle computeTrim() {
Rectangle trim= fShell.computeTrim(0, 0, 0, 0);
addInternalTrim(trim);
return trim;
}
/**
* Adds the internal trimmings to the given trim of the shell.
*
* @param trim the shell's trim, will be updated
* @since 3.4
*/
private void addInternalTrim(Rectangle trim) {
Rectangle textTrim= fText.computeTrim(0, 0, 0, 0);
trim.x+= textTrim.x;
trim.y+= textTrim.y;
trim.width+= textTrim.width;
trim.height+= textTrim.height;
if (fStatusField != null) {
trim.height+= fSeparator.computeSize(SWT.DEFAULT, SWT.DEFAULT).y;
trim.height+= fStatusField.computeSize(SWT.DEFAULT, SWT.DEFAULT).y;
trim.height+= 1; // verticalSpacing
}
}
/*
* @see org.eclipse.jface.text.IInformationControlExtension3#getBounds()
* @since 3.4
*/
public Rectangle getBounds() {
return fShell.getBounds();
}
/*
* @see org.eclipse.jface.text.IInformationControlExtension3#restoresLocation()
* @since 3.4
*/
public boolean restoresLocation() {
return false;
}
/*
* @see org.eclipse.jface.text.IInformationControlExtension3#restoresSize()
* @since 3.4
*/
public boolean restoresSize() {
return false;
}
/*
* @see org.eclipse.jface.text.IInformationControlExtension5#getInformationPresenterControlCreator()
* @since 3.4
*/
public IInformationControlCreator getInformationPresenterControlCreator() {
return new IInformationControlCreator() {
public IInformationControl createInformationControl(Shell parent) {
return new SourceViewerInformationControl(parent, true, fOrientation, null);
}
};
}
/*
* @see org.eclipse.jface.text.IInformationControlExtension5#containsControl(org.eclipse.swt.widgets.Control)
* @since 3.4
*/
public boolean containsControl(Control control) {
do {
if (control == fShell)
return true;
if (control instanceof Shell)
return false;
control= control.getParent();
} while (control != null);
return false;
}
/*
* @see org.eclipse.jface.text.IInformationControlExtension5#isVisible()
* @since 3.4
*/
public boolean isVisible() {
return fShell != null && !fShell.isDisposed() && fShell.isVisible();
}
/*
* @see org.eclipse.jface.text.IInformationControlExtension5#computeSizeConstraints(int, int)
*/
public Point computeSizeConstraints(int widthInChars, int heightInChars) {
GC gc= new GC(fText);
gc.setFont(fTextFont);
int width= gc.getFontMetrics().getAverageCharWidth();
int height= gc.getFontMetrics().getHeight();
gc.dispose();
return new Point(widthInChars * width, heightInChars * height);
}
}