package org.eclipse.swt.widgets; | |
/* | |
* Copyright (c) 2000, 2002 IBM Corp. All rights reserved. | |
* This file is 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 | |
*/ | |
import org.eclipse.swt.internal.win32.*; | |
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 present a range of continuous | |
* numeric values. | |
* <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> | |
* <p> | |
* IMPORTANT: This class is intended to be subclassed <em>only</em> | |
* within the SWT implementation. | |
* </p> | |
*/ | |
public class Scale extends Control { | |
static final int TrackBarProc; | |
static final TCHAR TrackBarClass = new TCHAR (0, OS.TRACKBAR_CLASS, true); | |
static { | |
WNDCLASS lpWndClass = new WNDCLASS (); | |
OS.GetClassInfo (0, TrackBarClass, lpWndClass); | |
TrackBarProc = lpWndClass.lpfnWndProc; | |
} | |
/** | |
* 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 Scale (Composite parent, int style) { | |
super (parent, checkStyle (style)); | |
} | |
/** | |
* Adds the listener to the collection of listeners who will | |
* be notified when the receiver's value changes, by sending | |
* it one of the messages defined in the <code>SelectionListener</code> | |
* interface. | |
* | |
* @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 | |
*/ | |
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); | |
} | |
int callWindowProc (int msg, int wParam, int lParam) { | |
if (handle == 0) return 0; | |
return OS.CallWindowProc (TrackBarProc, handle, msg, wParam, lParam); | |
} | |
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; | |
RECT rect = new RECT (); | |
OS.SendMessage (handle, OS.TBM_GETTHUMBRECT, 0, rect); | |
if ((style & SWT.HORIZONTAL) != 0) { | |
width += OS.GetSystemMetrics (OS.SM_CXHSCROLL) * 10; | |
int scrollY = OS.GetSystemMetrics (OS.SM_CYHSCROLL); | |
height += (rect.top * 2) + scrollY + (scrollY / 3); | |
} else { | |
int scrollX = OS.GetSystemMetrics (OS.SM_CXVSCROLL); | |
width += (rect.left * 2) + scrollX + (scrollX / 3); | |
height += OS.GetSystemMetrics (OS.SM_CYVSCROLL) * 10; | |
} | |
if (wHint != SWT.DEFAULT) width = wHint + (border * 2); | |
if (hHint != SWT.DEFAULT) height = hHint + (border * 2); | |
return new Point (width, height); | |
} | |
void createHandle () { | |
super.createHandle (); | |
OS.SendMessage (handle, OS.TBM_SETRANGEMAX, 0, 100); | |
OS.SendMessage (handle, OS.TBM_SETPAGESIZE, 0, 10); | |
OS.SendMessage (handle, OS.TBM_SETTICFREQ, 10, 0); | |
} | |
int defaultForeground () { | |
return OS.GetSysColor (OS.COLOR_BTNFACE); | |
} | |
/** | |
* Returns the amount that the receiver's value will be | |
* modified by when the up/down (or right/left) arrows | |
* are pressed. | |
* | |
* @return the increment | |
* | |
* @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> | |
*/ | |
public int getIncrement () { | |
checkWidget (); | |
return OS.SendMessage (handle, OS.TBM_GETLINESIZE, 0, 0); | |
} | |
/** | |
* Returns the maximum value which the receiver will allow. | |
* | |
* @return the maximum | |
* | |
* @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> | |
*/ | |
public int getMaximum () { | |
checkWidget (); | |
return OS.SendMessage (handle, OS.TBM_GETRANGEMAX, 0, 0); | |
} | |
/** | |
* Returns the minimum value which the receiver will allow. | |
* | |
* @return the minimum | |
* | |
* @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> | |
*/ | |
public int getMinimum () { | |
checkWidget (); | |
return OS.SendMessage (handle, OS.TBM_GETRANGEMIN, 0, 0); | |
} | |
/** | |
* Returns the amount that the receiver's value will be | |
* modified by when the page increment/decrement areas | |
* are selected. | |
* | |
* @return the page increment | |
* | |
* @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> | |
*/ | |
public int getPageIncrement () { | |
checkWidget (); | |
return OS.SendMessage (handle, OS.TBM_GETPAGESIZE, 0, 0); | |
} | |
/** | |
* Returns the single <em>selection</em> that is the receiver's position. | |
* | |
* @return the selection | |
* | |
* @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> | |
*/ | |
public int getSelection () { | |
checkWidget (); | |
return OS.SendMessage (handle, OS.TBM_GETPOS, 0, 0); | |
} | |
/** | |
* Removes the listener from the collection of listeners who will | |
* be notified when the receiver's value changes. | |
* | |
* @param listener the listener which should no longer 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); | |
} | |
void setBackgroundPixel (int pixel) { | |
if (background == pixel) return; | |
super.setBackgroundPixel (pixel); | |
/* | |
* Bug in Windows. Changing the background color of the Scale | |
* widget and calling InvalidateRect still draws with the old color. | |
* The fix is to post a fake WM_SETFOCUS event to cause it to redraw | |
* with the new background color. | |
* | |
* Note. This WM_SETFOCUS message causes recursion when | |
* setBackground is called from within the focus event listener. | |
*/ | |
OS.PostMessage (handle, OS.WM_SETFOCUS, 0, 0); | |
} | |
/** | |
* Sets the amount that the receiver's value will be | |
* modified by when the up/down (or right/left) arrows | |
* are pressed to the argument, which must be at least | |
* one. | |
* | |
* @param value the new increment (must be greater than zero) | |
* | |
* @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> | |
*/ | |
public void setIncrement (int increment) { | |
checkWidget (); | |
if (increment < 1) return; | |
int minimum = OS.SendMessage (handle, OS.TBM_GETRANGEMIN, 0, 0); | |
int maximum = OS.SendMessage (handle, OS.TBM_GETRANGEMAX, 0, 0); | |
if (increment > maximum - minimum) return; | |
OS.SendMessage (handle, OS.TBM_SETLINESIZE, 0, increment); | |
} | |
/** | |
* Sets the maximum value which the receiver will allow | |
* to be the argument which must be greater than or | |
* equal to zero. | |
* | |
* @param value the new maximum (must be zero or greater) | |
* | |
* @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> | |
*/ | |
public void setMaximum (int value) { | |
checkWidget (); | |
int minimum = OS.SendMessage (handle, OS.TBM_GETRANGEMIN, 0, 0); | |
if (0 <= minimum && minimum < value) { | |
OS.SendMessage (handle, OS.TBM_SETRANGEMAX, 1, value); | |
} | |
} | |
/** | |
* Sets the minimum value which the receiver will allow | |
* to be the argument which must be greater than or | |
* equal to zero. | |
* | |
* @param value the new minimum (must be zero or greater) | |
* | |
* @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> | |
*/ | |
public void setMinimum (int value) { | |
checkWidget (); | |
int maximum = OS.SendMessage (handle, OS.TBM_GETRANGEMAX, 0, 0); | |
if (0 <= value && value < maximum) { | |
OS.SendMessage (handle, OS.TBM_SETRANGEMIN, 1, value); | |
} | |
} | |
/** | |
* Sets the amount that the receiver's value will be | |
* modified by when the page increment/decrement areas | |
* are selected to the argument, which must be at least | |
* one. | |
* | |
* @return the page increment (must be greater than zero) | |
* | |
* @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> | |
*/ | |
public void setPageIncrement (int pageIncrement) { | |
checkWidget (); | |
if (pageIncrement < 1) return; | |
int minimum = OS.SendMessage (handle, OS.TBM_GETRANGEMIN, 0, 0); | |
int maximum = OS.SendMessage (handle, OS.TBM_GETRANGEMAX, 0, 0); | |
if (pageIncrement > maximum - minimum) return; | |
OS.SendMessage (handle, OS.TBM_SETPAGESIZE, 0, pageIncrement); | |
OS.SendMessage (handle, OS.TBM_SETTICFREQ, pageIncrement, 0); | |
} | |
/** | |
* Sets the single <em>selection</em> that is the receiver's | |
* value to the argument which must be greater than or equal | |
* to zero. | |
* | |
* @param value the new selection (must be zero or greater) | |
* | |
* @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> | |
*/ | |
public void setSelection (int value) { | |
checkWidget (); | |
if (value < 0) return; | |
OS.SendMessage (handle, OS.TBM_SETPOS, 1, value); | |
} | |
int widgetStyle () { | |
int bits = super.widgetStyle () | OS.WS_TABSTOP | OS.TBS_BOTH | OS.TBS_AUTOTICKS; | |
if ((style & SWT.HORIZONTAL) != 0) return bits | OS.TBS_HORZ; | |
return bits | OS.TBS_VERT; | |
} | |
TCHAR windowClass () { | |
return TrackBarClass; | |
} | |
int windowProc () { | |
return TrackBarProc; | |
} | |
LRESULT wmScrollChild (int wParam, int lParam) { | |
/* Do nothing when scrolling is ending */ | |
int code = wParam & 0xFFFF; | |
if (code == OS.TB_ENDTRACK) return null; | |
/* | |
* This code is intentionally commented. The event | |
* detail field is not currently supported on all | |
* platforms. | |
*/ | |
Event event = new Event (); | |
// switch (code) { | |
// /* | |
// * This line is intentionally commented. Do not set the detail | |
// * field to DRAG to indicate that the dragging has ended when the | |
// * scroll bar is finally positioned in TB_THUMBPOSITION. | |
// */ | |
//// case OS.TB_THUMBPOSITION: break; | |
// case OS.TB_THUMBTRACK: event.detail = SWT.DRAG; break; | |
// case OS.TB_TOP: event.detail = SWT.HOME; break; | |
// case OS.TB_BOTTOM: event.detail = SWT.END; break; | |
// case OS.TB_LINEDOWN: event.detail = SWT.ARROW_DOWN; break; | |
// case OS.TB_LINEUP: event.detail = SWT.ARROW_UP; break; | |
// case OS.TB_PAGEDOWN: event.detail = SWT.PAGE_DOWN; break; | |
// case OS.TB_PAGEUP: event.detail = SWT.PAGE_UP; break; | |
// } | |
/* | |
* Send the event because WM_HSCROLL and WM_VSCROLL | |
* are sent from a modal message loop in windows that | |
* is active when the user is scrolling. | |
*/ | |
sendEvent (SWT.Selection, event); | |
// widget could be disposed at this point | |
return null; | |
} | |
} |