216 lines
6.9 KiB
Java
216 lines
6.9 KiB
Java
package com.minres.scviewer.database.swt.internal;
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import org.eclipse.swt.SWT;
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import org.eclipse.swt.events.MouseEvent;
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import org.eclipse.swt.events.MouseListener;
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import org.eclipse.swt.events.MouseTrackAdapter;
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import org.eclipse.swt.events.PaintEvent;
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import org.eclipse.swt.events.PaintListener;
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import org.eclipse.swt.graphics.Font;
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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.GridData;
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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.Label;
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import org.eclipse.swt.widgets.Shell;
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import org.eclipse.swt.widgets.Table;
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import org.eclipse.swt.widgets.TableColumn;
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import org.eclipse.swt.widgets.TableItem;
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import org.eclipse.swt.widgets.ToolBar;
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import org.eclipse.swt.widgets.Tree;
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import org.eclipse.swt.widgets.Widget;
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import com.minres.scviewer.database.swt.Constants;
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import com.minres.scviewer.database.swt.ToolTipHelpTextProvider;
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import com.minres.scviewer.database.swt.ToolTipTableContentProvider;
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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 Label label;
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private Table table;
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private TableColumn nameCol;
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private TableColumn valueCol;
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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 hoverYOffset = 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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this.parentShell = parent;
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shell = new Shell(parent, SWT.ON_TOP | SWT.NO_FOCUS | SWT.TOOL);
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GridLayout gridLayout = new GridLayout();
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gridLayout.numColumns = 1;
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gridLayout.marginWidth = 2;
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gridLayout.marginHeight = 2;
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shell.setLayout(gridLayout);
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shell.setBackground(display.getSystemColor(SWT.COLOR_INFO_BACKGROUND));
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label = new Label(shell, SWT.NONE);
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label.setForeground(display.getSystemColor(SWT.COLOR_INFO_FOREGROUND));
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label.setBackground(display.getSystemColor(SWT.COLOR_INFO_BACKGROUND));
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label.setLayoutData(new GridData(GridData.FILL_HORIZONTAL |GridData.VERTICAL_ALIGN_CENTER));
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final Font font = new Font(Display.getCurrent(), "Terminal", 10, SWT.NORMAL);
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table = new Table(shell, SWT.NONE);
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table.setHeaderVisible(false);
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table.setLinesVisible(true);
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table.setFont(font);
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table.setForeground(display.getSystemColor(SWT.COLOR_INFO_FOREGROUND));
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table.setBackground(display.getSystemColor(SWT.COLOR_INFO_BACKGROUND));
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table.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
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nameCol = new TableColumn(table, SWT.LEFT);
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nameCol.setText("Name");
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valueCol = new TableColumn(table, SWT.LEFT);
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nameCol.setText("Value");
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shell.addPaintListener(new PaintListener() {
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@Override
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public void paintControl(PaintEvent e) {
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Rectangle area = shell.getClientArea();
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valueCol.setWidth(area.width - nameCol.getWidth());
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}
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});
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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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/*
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* Get out of the way if we attempt to activate the control underneath the tooltip
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*/
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control.addMouseListener(MouseListener.mouseDownAdapter(e -> {
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if (shell.isVisible())
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shell.setVisible(false);
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}));
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/*
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* Trap hover events to pop-up tooltip
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*/
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control.addMouseTrackListener(new MouseTrackAdapter () {
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@Override
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public void mouseExit(MouseEvent e) {
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if (shell.isVisible()) shell.setVisible(false);
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tipWidget = null;
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}
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@Override
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public void mouseHover (MouseEvent event) {
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Point pt = new Point (event.x, event.y);
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Widget widget = event.widget;
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if (widget instanceof ToolBar) {
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ToolBar w = (ToolBar) widget;
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widget = w.getItem (pt);
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}
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if (widget instanceof Table) {
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Table w = (Table) widget;
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widget = w.getItem (pt);
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}
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if (widget instanceof Tree) {
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Tree w = (Tree) widget;
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widget = w.getItem (pt);
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}
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if (widget == null) {
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shell.setVisible(false);
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tipWidget = null;
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return;
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}
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Point newPos = control.toDisplay(pt);
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if(shell.isFocusControl()) return;
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if (widget == tipWidget && tipPosition.equals(newPos) && shell.isVisible()) return;
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tipWidget = widget;
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tipPosition = newPos;
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boolean showDialog = false;
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Object o = widget.getData(Constants.CONTENT_PROVIDER_TAG);
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if(o != null) {
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ToolTipTableContentProvider provider = ((ToolTipTableContentProvider)o).initialize(widget, pt);
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label.setText(provider.getTableTitle());
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table.setRedraw(false);
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table.removeAll();
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for (String[] strings : provider.getTableContent()) {
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if(strings.length>0) {
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showDialog=true;
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TableItem item = new TableItem(table, SWT.NONE);
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item.setText(0, strings[0]);
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if(strings.length>1)
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item.setText(1, strings[1]);
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}
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}
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nameCol.pack();
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valueCol.pack();
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table.setRedraw(true);
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table.setVisible(true);
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} else {
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table.setVisible(false);
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}
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String text = (String) widget.getData(Constants.TEXT_PROVIDER_TAG);
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if(text != null) {
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label.setText(text != null ? text : "Hover test should go here");
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showDialog=true;
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}
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if(showDialog) {
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shell.pack();
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setHoverLocation(shell, tipPosition);
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shell.setVisible(true);
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}
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}
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});
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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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ToolTipHelpTextProvider handler = (ToolTipHelpTextProvider)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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// control.addKeyListener(KeyListener.keyPressedAdapter( e-> {
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// if (e.keyCode == SWT.F2 && shell.isVisible()) {
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// shell.setFocus();
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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 + hoverYOffset, displayBounds.height - shellBounds.height), 0);
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shell.setBounds(shellBounds);
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}
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} |