/*******************************************************************************
* Copyright (c) 2000, 2003 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.widgets;
import org.eclipse.swt.internal.motif.*;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.events.*;
/**
* Instances of the receiver represent a selectable user interface object
* that allows the user to drag a rubber banded outline of the sash within
* the parent control.
* <dl>
* <dt><b>Styles:</b></dt>
* <dd>HORIZONTAL, VERTICAL</dd>
* <dt><b>Events:</b></dt>
* <dd>Selection</dd>
* </dl>
* <p>
* Note: Only one of the styles HORIZONTAL and VERTICAL may be specified.
* </p><p>
* IMPORTANT: This class is intended to be subclassed <em>only</em>
* within the SWT implementation.
* </p>
*/
public class Sash extends Control {
boolean dragging;
int startX, startY, lastX, lastY;
int cursor;
private final static int INCREMENT = 1;
private final static int PAGE_INCREMENT = 9;
/**
* Constructs a new instance of this class given its parent
* and a style value describing its behavior and appearance.
* <p>
* The style value is either one of the style constants defined in
* class <code>SWT</code> which is applicable to instances of this
* class, or must be built by <em>bitwise OR</em>'ing together
* (that is, using the <code>int</code> "|" operator) two or more
* of those <code>SWT</code> style constants. The class description
* lists the style constants that are applicable to the class.
* Style bits are also inherited from superclasses.
* </p>
*
* @param parent a composite control which will be the parent of the new instance (cannot be null)
* @param style the style of control to construct
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
* <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
* </ul>
*
* @see SWT#HORIZONTAL
* @see SWT#VERTICAL
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
public Sash (Composite parent, int style) {
super (parent, checkStyle (style));
}
/**
* Adds the listener to the collection of listeners who will
* be notified when the control is selected, by sending
* it one of the messages defined in the <code>SelectionListener</code>
* interface.
* <p>
* When <code>widgetSelected</code> is called, the x, y, width, and height fields of the event object are valid.
* If the reciever is being dragged, the event object detail field contains the value <code>SWT.DRAG</code>.
* <code>widgetDefaultSelected</code> is not called.
* </p>
*
* @param listener the listener which should be notified
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
* </ul>
*
* @see SelectionListener
* @see #removeSelectionListener
* @see SelectionEvent
*/
public void addSelectionListener(SelectionListener listener) {
checkWidget();
if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
TypedListener typedListener = new TypedListener(listener);
addListener(SWT.Selection,typedListener);
addListener(SWT.DefaultSelection,typedListener);
}
static int checkStyle (int style) {
return checkBits (style, SWT.HORIZONTAL, SWT.VERTICAL, 0, 0, 0, 0);
}
public Point computeSize (int wHint, int hHint, boolean changed) {
checkWidget();
int border = getBorderWidth ();
int width = border * 2, height = border * 2;
if ((style & SWT.HORIZONTAL) != 0) {
width += DEFAULT_WIDTH; height += 3;
} else {
width += 3; height += DEFAULT_HEIGHT;
}
if (wHint != SWT.DEFAULT) width = wHint + (border * 2);
if (hHint != SWT.DEFAULT) height = hHint + (border * 2);
return new Point (width, height);
}
void createHandle (int index) {
state |= HANDLE;
int border = (style & SWT.BORDER) != 0 ? 1 : 0;
int [] argList = {
OS.XmNborderWidth, border,
OS.XmNmarginWidth, 0,
OS.XmNmarginHeight, 0,
OS.XmNresizePolicy, OS.XmRESIZE_NONE,
OS.XmNancestorSensitive, 1,
OS.XmNtraversalOn, 0,
};
int parentHandle = parent.handle;
handle = OS.XmCreateDrawingArea (parentHandle, null, argList, argList.length / 2);
}
void drawBand (int x, int y, int width, int height) {
int display = OS.XtDisplay (parent.handle);
if (display == 0) return;
int window = OS.XtWindow (parent.handle);
if (window == 0) return;
int [] argList = {OS.XmNforeground, 0, OS.XmNbackground, 0};
OS.XtGetValues (parent.handle, argList, argList.length / 2);
int color = argList [1] ^ argList [3];
byte [] bits = {-86, 85, -86, 85, -86, 85, -86, 85};
int stipplePixmap = OS.XCreateBitmapFromData (display, window, bits, 8, 8);
int gc = OS.XCreateGC (display, window, 0, null);
OS.XSetForeground (display, gc, color);
OS.XSetStipple (display, gc, stipplePixmap);
OS.XSetSubwindowMode (display, gc, OS.IncludeInferiors);
OS.XSetFillStyle (display, gc, OS.FillStippled);
OS.XSetFunction (display, gc, OS.GXxor);
OS.XFillRectangle (display, window, gc, x, y, width, height);
OS.XFreePixmap (display, stipplePixmap);
OS.XFreeGC (display, gc);
}
void propagateWidget (boolean enabled) {
int xCursor = enabled && super.cursor != null ? super.cursor.handle : cursor;
propagateHandle (enabled, handle, xCursor);
}
void realizeChildren () {
super.realizeChildren ();
int xWindow = OS.XtWindow (handle);
if (xWindow == 0) return;
int xDisplay = OS.XtDisplay (handle);
if (xDisplay == 0) return;
if ((style & SWT.HORIZONTAL) != 0) {
cursor = OS.XCreateFontCursor (xDisplay, OS.XC_sb_v_double_arrow);
} else {
cursor = OS.XCreateFontCursor (xDisplay, OS.XC_sb_h_double_arrow);
}
if (super.cursor == null && isEnabled ()) {
OS.XDefineCursor (xDisplay, xWindow, cursor);
OS.XFlush (xDisplay);
}
}
void releaseWidget () {
super.releaseWidget ();
if (cursor != 0) {
int display = OS.XtDisplay (handle);
if (display != 0) OS.XFreeCursor (display, cursor);
}
cursor = 0;
}
/**
* Removes the listener from the collection of listeners who will
* be notified when the control is selected.
*
* @param listener the listener which should be notified
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
* </ul>
*
* @see SelectionListener
* @see #addSelectionListener
*/
public void removeSelectionListener(SelectionListener listener) {
checkWidget();
if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
if (eventTable == null) return;
eventTable.unhook(SWT.Selection, listener);
eventTable.unhook(SWT.DefaultSelection,listener);
}
public void setCursor (Cursor cursor) {
checkWidget();
super.setCursor (cursor);
if (cursor == null && this.cursor != 0) {
int xWindow = OS.XtWindow (handle);
if (xWindow == 0) return;
int xDisplay = OS.XtDisplay (handle);
if (xDisplay == 0) return;
OS.XDefineCursor (xDisplay, xWindow, this.cursor);
OS.XFlush (xDisplay);
}
}
public boolean setFocus () {
checkWidget();
return forceFocus ();
}
int XButtonPress (int w, int client_data, int call_data, int continue_to_dispatch) {
int result = super.XButtonPress (w, client_data, call_data, continue_to_dispatch);
if (result != 0) return result;
XButtonEvent xEvent = new XButtonEvent ();
OS.memmove (xEvent, call_data, XButtonEvent.sizeof);
if (xEvent.button != 1) return result;
short [] x_root = new short [1], y_root = new short [1];
OS.XtTranslateCoords (handle, (short) 0, (short) 0, x_root, y_root);
startX = xEvent.x_root - x_root [0];
startY = xEvent.y_root - y_root [0];
int [] argList = {OS.XmNx, 0, OS.XmNy, 0, OS.XmNwidth, 0, OS.XmNheight, 0, OS.XmNborderWidth, 0};
OS.XtGetValues (handle, argList, argList.length / 2);
int border = argList [9], width = argList [5] + (border * 2), height = argList [7] + (border * 2);
lastX = ((short) argList [1]) - border; lastY = ((short) argList [3]) - border;
/* The event must be sent because its doit flag is used. */
Event event = new Event ();
event.detail = SWT.DRAG;
event.time = xEvent.time;
event.x = lastX;
event.y = lastY;
event.width = width;
event.height = height;
/*
* It is possible (but unlikely) that client code could have disposed
* the widget in the selection event. If this happens end the processing
* of this message by returning.
*/
sendEvent (SWT.Selection, event);
if (isDisposed ()) return result;
if (event.doit) {
dragging = true;
OS.XmUpdateDisplay (handle);
drawBand (lastX = event.x, lastY = event.y, width, height);
}
return result;
}
int XButtonRelease (int w, int client_data, int call_data, int continue_to_dispatch) {
int result = super.XButtonRelease (w, client_data, call_data, continue_to_dispatch);
if (result != 0) return result;
XButtonEvent xEvent = new XButtonEvent ();
OS.memmove (xEvent, call_data, XButtonEvent.sizeof);
if (xEvent.button != 1) return result;
if (!dragging) return result;
dragging = false;
int [] argList = {OS.XmNwidth, 0, OS.XmNheight, 0, OS.XmNborderWidth, 0};
OS.XtGetValues (handle, argList, argList.length / 2);
int border = argList [5];
int width = argList [1] + (border * 2), height = argList [3] + (border * 2);
/* The event must be sent because its doit flag is used. */
Event event = new Event ();
event.time = xEvent.time;
event.x = lastX;
event.y = lastY;
event.width = width;
event.height = height;
drawBand (lastX, lastY, width, height);
sendEvent (SWT.Selection, event);
/* widget could be disposed here */
return result;
}
int xFocusIn (XFocusChangeEvent xEvent) {
int result = super.xFocusIn (xEvent);
if (handle == 0) return result;
int [] argList = {OS.XmNx, 0, OS.XmNy, 0};
OS.XtGetValues (handle, argList, argList.length / 2);
lastX = argList [1];
lastY = argList [3];
return result;
}
int XKeyPress (int w, int client_data, int call_data, int continue_to_dispatch) {
int result = super.XKeyPress (w, client_data, call_data, continue_to_dispatch);
if (result != 0) return result;
XKeyEvent xEvent = new XKeyEvent ();
OS.memmove (xEvent, call_data, XKeyEvent.sizeof);
byte [] buffer = new byte [1];
int [] keysym = new int [1];
OS.XLookupString (xEvent, buffer, buffer.length, keysym, null);
switch (keysym [0]) {
case OS.XK_Left:
case OS.XK_Right:
case OS.XK_Up:
case OS.XK_Down:
int xChange = 0, yChange = 0;
int stepSize = PAGE_INCREMENT;
if ((xEvent.state & OS.ControlMask) != 0) stepSize = INCREMENT;
if ((style & SWT.VERTICAL) != 0) {
if (keysym [0] == OS.XK_Up || keysym [0] == OS.XK_Down) break;
xChange = keysym [0] == OS.XK_Left ? -stepSize : stepSize;
} else {
if (keysym [0] == OS.XK_Left || keysym [0] == OS.XK_Right) break;
yChange = keysym [0] == OS.XK_Up ? -stepSize : stepSize;
}
int [] argList1 = {OS.XmNwidth, 0, OS.XmNheight, 0, OS.XmNborderWidth, 0};
OS.XtGetValues (handle, argList1, argList1.length / 2);
int border = argList1 [5];
int width = argList1 [1] + (border * 2), height = argList1 [3] + (border * 2);
int [] argList2 = {OS.XmNwidth, 0, OS.XmNheight, 0, OS.XmNborderWidth, 0};
OS.XtGetValues (parent.handle, argList2, argList2.length / 2);
int parentBorder = argList2 [5];
int parentWidth = argList2 [1] + (parentBorder * 2);
int parentHeight = argList2 [3] + (parentBorder * 2);
int newX = lastX, newY = lastY;
if ((style & SWT.VERTICAL) != 0) {
newX = Math.min (Math.max (0, lastX + xChange - parentBorder - startX), parentWidth - width);
} else {
newY = Math.min (Math.max (0, lastY + yChange - parentBorder - startY), parentHeight - height);
}
if (newX == lastX && newY == lastY) return result;
/* Ensure that the pointer image does not change */
int xDisplay = display.xDisplay;
int xWindow = OS.XtWindow (parent.handle);
int ptrGrabResult = OS.XGrabPointer (
xDisplay,
xWindow,
1,
OS.None,
OS.GrabModeAsync,
OS.GrabModeAsync,
OS.None,
cursor,
OS.CurrentTime);
/* The event must be sent because its doit flag is used. */
Event event = new Event ();
event.time = xEvent.time;
event.x = newX;
event.y = newY;
event.width = width;
event.height = height;
sendEvent (SWT.Selection, event);
if (ptrGrabResult == OS.GrabSuccess) OS.XUngrabPointer (xDisplay, OS.CurrentTime);
/*
* It is possible (but unlikely) that client code could have disposed
* the widget in the selection event. If this happens end the processing
* of this message by returning.
*/
if (isDisposed ()) break;
if (event.doit) {
lastX = event.x; lastY = event.y;
/* Adjust the pointer position */
int cursorX = newX; int cursorY = newY;
if ((style & SWT.VERTICAL) != 0) {
cursorY += height / 2;
} else {
cursorX += width / 2;
}
OS.XWarpPointer (xDisplay, OS.None, xWindow, 0, 0, 0, 0, cursorX, cursorY);
}
break;
}
return result;
}
int XPointerMotion (int w, int client_data, int call_data, int continue_to_dispatch) {
int result = super.XPointerMotion (w, client_data, call_data, continue_to_dispatch);
if (result != 0) return result;
XMotionEvent xEvent = new XMotionEvent ();
OS.memmove (xEvent, call_data, XMotionEvent.sizeof);
if (!dragging || (xEvent.state & OS.Button1Mask) == 0) return result;
short [] x_root = new short [1], y_root = new short [1];
OS.XtTranslateCoords (handle, (short) 0, (short) 0, x_root, y_root);
int eventX = xEvent.x_root - x_root [0], eventY = xEvent.y_root - y_root [0];
int [] argList1 = {OS.XmNx, 0, OS.XmNy, 0, OS.XmNwidth, 0, OS.XmNheight, 0, OS.XmNborderWidth, 0};
OS.XtGetValues (handle, argList1, argList1.length / 2);
int border = argList1 [9], x = ((short) argList1 [1]) - border, y = ((short) argList1 [3]) - border;
int width = argList1 [5] + (border * 2), height = argList1 [7] + (border * 2);
int [] argList2 = {OS.XmNwidth, 0, OS.XmNheight, 0, OS.XmNborderWidth, 0};
OS.XtGetValues (parent.handle, argList2, argList2.length / 2);
int parentBorder = argList2 [5];
int parentWidth = argList2 [1] + (parentBorder * 2);
int parentHeight = argList2 [3] + (parentBorder * 2);
int newX = lastX, newY = lastY;
if ((style & SWT.VERTICAL) != 0) {
newX = Math.min (Math.max (0, eventX + x - startX - parentBorder), parentWidth - width);
} else {
newY = Math.min (Math.max (0, eventY + y - startY - parentBorder), parentHeight - height);
}
if (newX == lastX && newY == lastY) return result;
drawBand (lastX, lastY, width, height);
/* The event must be sent because its doit flag is used. */
Event event = new Event ();
event.detail = SWT.DRAG;
event.time = xEvent.time;
event.x = newX;
event.y = newY;
event.width = width;
event.height = height;
/*
* It is possible (but unlikely) that client code could have disposed
* the widget in the selection event. If this happens end the processing
* of this message by returning.
*/
sendEvent (SWT.Selection, event);
if (isDisposed ()) return result;
if (event.doit) {
lastX = event.x; lastY = event.y;
OS.XmUpdateDisplay (handle);
drawBand (lastX, lastY, width, height);
}
return result;
}
}
