138 lines
4.4 KiB
Java
138 lines
4.4 KiB
Java
package com.minres.scviewer.database.ui.swt.internal;
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import org.eclipse.swt.SWT;
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import org.eclipse.swt.graphics.Point;
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import org.eclipse.swt.graphics.Rectangle;
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import org.eclipse.swt.layout.FillLayout;
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import org.eclipse.swt.layout.GridLayout;
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import org.eclipse.swt.widgets.Control;
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import org.eclipse.swt.widgets.Display;
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import org.eclipse.swt.widgets.Event;
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import org.eclipse.swt.widgets.Label;
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import org.eclipse.swt.widgets.Listener;
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import org.eclipse.swt.widgets.Shell;
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import org.eclipse.swt.widgets.Widget;
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import com.minres.scviewer.database.ui.swt.Constants;
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import com.minres.scviewer.database.ui.swt.IToolTipContentProvider;
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import com.minres.scviewer.database.ui.swt.IToolTipHelpTextProvider;
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class ToolTipHandler {
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private final Display display;
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private Shell parentShell;
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private Shell shell;
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private Widget tipWidget; // widget this tooltip is hovering over
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private Point tipPosition; // the position being hovered over
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private static final int HOVER_YOFFSET = 1;
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/**
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* Creates a new tooltip handler
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*
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* @param parent the parent Shell
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*/
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public ToolTipHandler(Shell parent) {
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display = parent.getDisplay();
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parentShell = parent;
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}
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/**
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* Enables customized hover help for a specified control
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*
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* @control the control on which to enable hoverhelp
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*/
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public void activateHoverHelp(final Control control) {
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Listener listener = new Listener () {
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Shell shell = null;
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@Override
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public void handleEvent (Event event) {
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switch (event.type) {
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case SWT.KeyDown:
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if (shell != null && shell.isVisible() && event.keyCode == SWT.F2)
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shell.setFocus();
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break;
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case SWT.Dispose:
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case SWT.MouseMove:
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case SWT.MouseDown:
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if (shell != null){
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shell.dispose ();
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shell = null;
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tipWidget=null;
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}
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break;
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case SWT.MouseHover:
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createHoverWindow(control, event);
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break;
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default:
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/* do nothing */
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}
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}
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private void createHoverWindow(final Control control, Event event) {
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Object o = control.getData(Constants.CONTENT_PROVIDER_TAG);
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if(o instanceof IToolTipContentProvider) {
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IToolTipContentProvider provider = ((IToolTipContentProvider)o);
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Point pt = new Point (event.x, event.y);
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tipPosition = control.toDisplay(pt);
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if (shell != null && !shell.isDisposed ()) shell.dispose ();
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shell = new Shell (parentShell, SWT.NO_FOCUS | SWT.TOOL);
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shell.setBackground (display.getSystemColor (SWT.COLOR_INFO_BACKGROUND));
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GridLayout layout = new GridLayout(1, true);
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layout.verticalSpacing=0;
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layout.horizontalSpacing=0;
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layout.marginWidth = 0;
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layout.marginHeight = 0;
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shell.setLayout(layout);
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boolean visible = provider.createContent(shell, pt);
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shell.pack();
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shell.setSize(shell.computeSize(SWT.DEFAULT, SWT.DEFAULT));
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setHoverLocation(shell, tipPosition);
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shell.setVisible (visible);
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if(visible)
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tipWidget=event.widget;
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}
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}
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};
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control.addListener (SWT.Dispose, listener);
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control.addListener (SWT.KeyDown, listener);
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control.addListener (SWT.MouseHover, listener);
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control.addListener (SWT.MouseDown, listener);
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/*
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* Trap F1 Help to pop up a custom help box
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*/
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control.addHelpListener(event -> {
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if (tipWidget == null) return;
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IToolTipHelpTextProvider handler = (IToolTipHelpTextProvider)tipWidget.getData(Constants.HELP_PROVIDER_TAG);
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if (handler == null) return;
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String text = handler.getHelpText(tipWidget);
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if (text == null) return;
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if (shell.isVisible()) {
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shell.setVisible(false);
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Shell helpShell = new Shell(parentShell, SWT.SHELL_TRIM);
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helpShell.setLayout(new FillLayout());
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Label label = new Label(helpShell, SWT.NONE);
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label.setText(text);
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helpShell.pack();
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setHoverLocation(helpShell, tipPosition);
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helpShell.open();
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}
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});
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}
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/**
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* Sets the location for a hovering shell
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* @param shell the object that is to hover
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* @param position the position of a widget to hover over
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* @return the top-left location for a hovering box
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*/
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private void setHoverLocation(Shell shell, Point position) {
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Rectangle displayBounds = shell.getDisplay().getBounds();
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Rectangle shellBounds = shell.getBounds();
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shellBounds.x = Math.max(Math.min(position.x, displayBounds.width - shellBounds.width), 0);
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shellBounds.y = Math.max(Math.min(position.y + HOVER_YOFFSET, displayBounds.height - shellBounds.height), 0);
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shell.setBounds(shellBounds);
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}
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} |