package org.eclipse.swt.widgets; | |
/* | |
* (c) Copyright IBM Corp. 2000, 2001. | |
* All Rights Reserved | |
*/ | |
import org.eclipse.swt.internal.*; | |
import org.eclipse.swt.internal.win32.*; | |
import org.eclipse.swt.*; | |
import org.eclipse.swt.graphics.*; | |
import org.eclipse.swt.events.*; | |
/** | |
* Instances of this class are selectable user interface | |
* objects that represent a range of positive, numeric values. | |
* <p> | |
* At any given moment, a given slider will have a | |
* single <em>selection</em> that is considered to be its | |
* value, which is constrained to be within the range of | |
* values the slider represents (that is, between its | |
* <em>minimum</em> and <em>maximum</em> values). | |
* </p><p> | |
* Typically, sliders will be made up of five areas: | |
* <ol> | |
* <li>an arrow button for decrementing the value</li> | |
* <li>a page decrement area for decrementing the value by a larger amount</li> | |
* <li>a <em>thumb</em> for modifying the value by mouse dragging</li> | |
* <li>a page increment area for incrementing the value by a larger amount</li> | |
* <li>an arrow button for incrementing the value</li> | |
* </ol> | |
* Based on their style, sliders are either <code>HORIZONTAL</code> | |
* (which have left and right facing buttons for incrementing and | |
* decrementing the value) or <code>VERTICAL</code> (which have | |
* up and down facing buttons for incrementing and decrementing | |
* the value). | |
* </p><p> | |
* On some platforms, the size of the slider's thumb can be | |
* varied relative to the magnitude of the range of values it | |
* represents (that is, relative to the difference between its | |
* maximum and minimum values). Typically, this is used to | |
* indicate some proportional value such as the ratio of the | |
* visible area of a document to the total amount of space that | |
* it would take to display it. SWT supports setting the thumb | |
* size even if the underlying platform does not, but in this | |
* case the appearance of the slider will not change. | |
* </p> | |
* <dl> | |
* <dt><b>Styles:</b></dt> | |
* <dd>HORIZONTAL, VERTICAL</dd> | |
* <dt><b>Events:</b></dt> | |
* <dd>Selection</dd> | |
* </dl> | |
* <p> | |
* IMPORTANT: This class is <em>not</em> intended to be subclassed. | |
* | |
* @see ScrollBar | |
*/ | |
public class Slider extends Control { | |
int increment, pageIncrement; | |
static final int ScrollBarProc; | |
static final TCHAR ScrollBarClass = new TCHAR (0, "SCROLLBAR", true); | |
static { | |
WNDCLASS lpWndClass = new WNDCLASS (); | |
OS.GetClassInfo (0, ScrollBarClass, lpWndClass); | |
ScrollBarProc = 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 | |
* for all SWT widget classes should include a comment which | |
* describes the style constants which are applicable to the class. | |
* </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 | |
* @see Widget#checkSubclass | |
* @see Widget#getStyle | |
*/ | |
public Slider (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. | |
* <p> | |
* When <code>widgetSelected</code> is called, the event object detail field contains one of the following values: | |
* <code>0</code> - for the end of a drag. | |
* <code>SWT.DRAG</code>. | |
* <code>SWT.HOME</code>. | |
* <code>SWT.END</code>. | |
* <code>SWT.ARROW_DOWN</code>. | |
* <code>SWT.ARROW_UP</code>. | |
* <code>SWT.PAGE_DOWN</code>. | |
* <code>SWT.PAGE_UP</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); | |
} | |
int callWindowProc (int msg, int wParam, int lParam) { | |
if (handle == 0) return 0; | |
return OS.CallWindowProc (ScrollBarProc, 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; | |
if ((style & SWT.HORIZONTAL) != 0) { | |
width += OS.GetSystemMetrics (OS.SM_CXHSCROLL) * 10; | |
height += OS.GetSystemMetrics (OS.SM_CYHSCROLL); | |
} else { | |
width += OS.GetSystemMetrics (OS.SM_CXVSCROLL); | |
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 createWidget () { | |
super.createWidget (); | |
increment = 1; | |
pageIncrement = 10; | |
/* | |
* Set the intial values of the maximum | |
* to 100 and the thumb to 10. Note that | |
* info.nPage needs to be 11 in order to | |
* get a thumb that is 10. | |
*/ | |
SCROLLINFO info = new SCROLLINFO (); | |
info.cbSize = SCROLLINFO.sizeof; | |
info.fMask = OS.SIF_ALL; | |
info.nMax = 100; | |
info.nPage = 11; | |
OS.SetScrollInfo (handle, OS.SB_CTL, info, true); | |
} | |
int defaultBackground () { | |
return OS.GetSysColor (OS.COLOR_SCROLLBAR); | |
} | |
int defaultForeground () { | |
return OS.GetSysColor (OS.COLOR_BTNFACE); | |
} | |
public boolean getEnabled () { | |
checkWidget (); | |
return (state & DISABLED) == 0; | |
} | |
/** | |
* 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 increment; | |
} | |
/** | |
* 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 (); | |
SCROLLINFO info = new SCROLLINFO (); | |
info.cbSize = SCROLLINFO.sizeof; | |
info.fMask = OS.SIF_RANGE; | |
OS.GetScrollInfo (handle, OS.SB_CTL, info); | |
return info.nMax; | |
} | |
/** | |
* 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 (); | |
SCROLLINFO info = new SCROLLINFO (); | |
info.cbSize = SCROLLINFO.sizeof; | |
info.fMask = OS.SIF_RANGE; | |
OS.GetScrollInfo (handle, OS.SB_CTL, info); | |
return info.nMin; | |
} | |
/** | |
* 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 pageIncrement; | |
} | |
/** | |
* Returns the single <em>selection</em> that is the receiver's value. | |
* | |
* @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 (); | |
SCROLLINFO info = new SCROLLINFO (); | |
info.cbSize = SCROLLINFO.sizeof; | |
info.fMask = OS.SIF_POS; | |
OS.GetScrollInfo (handle, OS.SB_CTL, info); | |
return info.nPos; | |
} | |
/** | |
* Returns the size of the receiver's thumb relative to the | |
* difference between its maximum and minimum values. | |
* | |
* @return the thumb value | |
* | |
* @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 getThumb () { | |
checkWidget (); | |
SCROLLINFO info = new SCROLLINFO (); | |
info.cbSize = SCROLLINFO.sizeof; | |
info.fMask = OS.SIF_PAGE; | |
OS.GetScrollInfo (handle, OS.SB_CTL, info); | |
if (info.nPage != 0) --info.nPage; | |
return info.nPage; | |
} | |
/** | |
* 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 setBounds (int x, int y, int width, int height, int flags) { | |
super.setBounds (x, y, width, height, flags); | |
/* | |
* Bug in Windows. If the scroll bar is resized when it has focus, | |
* the flashing cursor that is used to show that the scroll bar has | |
* focus is not moved. The fix is to post a fake WM_SETFOCUS to | |
* get the scroll bar to recompute the size of the flashing cursor. | |
*/ | |
if (OS.GetFocus () == handle) { | |
OS.PostMessage (handle, OS.WM_SETFOCUS, 0, 0); | |
} | |
} | |
public void setEnabled (boolean enabled) { | |
checkWidget (); | |
if (OS.IsWinCE) { | |
super.setEnabled (enabled); | |
} else { | |
int flags = enabled ? OS.ESB_ENABLE_BOTH : OS.ESB_DISABLE_BOTH; | |
OS.EnableScrollBar (handle, OS.SB_CTL, flags); | |
} | |
state &= ~DISABLED; | |
if (!enabled) state |= DISABLED; | |
} | |
/** | |
* 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 value) { | |
checkWidget (); | |
if (value < 1) return; | |
increment = value; | |
} | |
/** | |
* 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 (); | |
if (value < 0) return; | |
SCROLLINFO info = new SCROLLINFO (); | |
info.cbSize = SCROLLINFO.sizeof; | |
info.fMask = OS.SIF_RANGE | OS.SIF_DISABLENOSCROLL; | |
OS.GetScrollInfo (handle, OS.SB_CTL, info); | |
if (value - info.nMin - info.nPage < 1) return; | |
info.nMax = value; | |
OS.SetScrollInfo (handle, OS.SB_CTL, info, (state & DISABLED) == 0); | |
/* | |
* Feature in Windows. Using SIF_DISABLENOSCROLL, | |
* SetScrollInfo () can change enabled and disabled | |
* state of the scroll bar causing a scroll bar that | |
* was disabled by the application to become enabled. | |
* The fix is to disable the scroll bar (again) when | |
* the application has disabled the scroll bar. | |
*/ | |
if ((state & DISABLED) != 0) { | |
if (OS.IsWinCE) { | |
OS.EnableWindow (handle, false); | |
} else { | |
OS.EnableScrollBar (handle, OS.SB_CTL, OS.ESB_DISABLE_BOTH); | |
} | |
} | |
/* | |
* Bug in Windows. If the thumb is resized when it has focus, | |
* the flashing cursor that is used to show that the scroll bar has | |
* focus is not moved. The fix is to post a fake WM_SETFOCUS to | |
* get the scroll bar to recompute the size of the flashing cursor. | |
*/ | |
if (OS.GetFocus () == handle) { | |
OS.PostMessage (handle, OS.WM_SETFOCUS, 0, 0); | |
} | |
} | |
/** | |
* 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 (); | |
if (value < 0) return; | |
SCROLLINFO info = new SCROLLINFO (); | |
info.cbSize = SCROLLINFO.sizeof; | |
info.fMask = OS.SIF_RANGE | OS.SIF_DISABLENOSCROLL; | |
OS.GetScrollInfo (handle, OS.SB_CTL, info); | |
if (info.nMax - value - info.nPage < 1) return; | |
info.nMin = value; | |
OS.SetScrollInfo (handle, OS.SB_CTL, info, true); | |
/* | |
* Feature in Windows. Using SIF_DISABLENOSCROLL, | |
* SetScrollInfo () can change enabled and disabled | |
* state of the scroll bar causing a scroll bar that | |
* was disabled by the application to become enabled. | |
* The fix is to disable the scroll bar (again) when | |
* the application has disabled the scroll bar. | |
*/ | |
if ((state & DISABLED) != 0) { | |
if (OS.IsWinCE) { | |
OS.EnableWindow (handle, false); | |
} else { | |
OS.EnableScrollBar (handle, OS.SB_CTL, OS.ESB_DISABLE_BOTH); | |
} | |
} | |
/* | |
* Bug in Windows. If the thumb is resized when it has focus, | |
* the flashing cursor that is used to show that the scroll bar has | |
* focus is not moved. The fix is to post a fake WM_SETFOCUS to | |
* get the scroll bar to recompute the size of the flashing cursor. | |
*/ | |
if (OS.GetFocus () == handle) { | |
OS.PostMessage (handle, OS.WM_SETFOCUS, 0, 0); | |
} | |
} | |
/** | |
* 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 value) { | |
checkWidget (); | |
if (value < 1) return; | |
pageIncrement = value; | |
} | |
/** | |
* 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; | |
SCROLLINFO info = new SCROLLINFO (); | |
info.cbSize = SCROLLINFO.sizeof; | |
info.fMask = OS.SIF_POS; | |
info.nPos = value; | |
OS.SetScrollInfo (handle, OS.SB_CTL, info, true); | |
} | |
/** | |
* Sets the size of the receiver's thumb relative to the | |
* difference between its maximum and minimum values to the | |
* argument which must be at least one. | |
* | |
* @param value the new thumb value (must be at least one) | |
* | |
* @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 ScrollBar | |
*/ | |
public void setThumb (int value) { | |
checkWidget (); | |
/* Position the thumb */ | |
if (value < 1) return; | |
SCROLLINFO info = new SCROLLINFO (); | |
info.cbSize = SCROLLINFO.sizeof; | |
info.fMask = OS.SIF_PAGE | OS.SIF_RANGE | OS.SIF_DISABLENOSCROLL; | |
OS.GetScrollInfo (handle, OS.SB_CTL, info); | |
if (info.nMax - info.nMin - value < 0) return; | |
info.nPage = value; | |
if (info.nPage != 0) info.nPage++; | |
OS.SetScrollInfo (handle, OS.SB_CTL, info, true); | |
/* | |
* Feature in Windows. Using SIF_DISABLENOSCROLL, | |
* SetScrollInfo () can change enabled and disabled | |
* state of the scroll bar causing a scroll bar that | |
* was disabled by the application to become enabled. | |
* The fix is to disable the scroll bar (again) when | |
* the application has disabled the scroll bar. | |
*/ | |
if ((state & DISABLED) != 0) { | |
if (OS.IsWinCE) { | |
OS.EnableWindow (handle, false); | |
} else { | |
OS.EnableScrollBar (handle, OS.SB_CTL, OS.ESB_DISABLE_BOTH); | |
} | |
} | |
/* | |
* Bug in Windows. If the thumb is resized when it has focus, | |
* the flashing cursor that is used to show that the scroll bar has | |
* focus is not moved. The fix is to post a fake WM_SETFOCUS to | |
* get the scroll bar to recompute the size of the flashing cursor. | |
*/ | |
if (OS.GetFocus () == handle) { | |
OS.PostMessage (handle, OS.WM_SETFOCUS, 0, 0); | |
} | |
} | |
/** | |
* Sets the receiver's selection, minimum value, maximum | |
* value, thumb, increment and page increment all at once. | |
* <p> | |
* Note: This is equivalent to setting the values individually | |
* using the appropriate methods, but may be implemented in a | |
* more efficient fashion on some platforms. | |
* </p> | |
* | |
* @param selection the new selection value | |
* @param minimum the new minimum value | |
* @param maximum the new maximum value | |
* @param thumb the new thumb value | |
* @param increment the new increment value | |
* @param pageIncrement the new pageIncrement value | |
* | |
* @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 setValues (int selection, int minimum, int maximum, int thumb, int increment, int pageIncrement) { | |
checkWidget (); | |
if (selection < 0) return; | |
if (minimum < 0) return; | |
if (maximum < 0) return; | |
if (thumb < 1) return; | |
if (maximum - minimum - thumb < 0) return; | |
if (increment < 1) return; | |
if (pageIncrement < 1) return; | |
this.increment = increment; | |
this.pageIncrement = pageIncrement; | |
SCROLLINFO info = new SCROLLINFO (); | |
info.cbSize = SCROLLINFO.sizeof; | |
info.fMask = OS.SIF_POS | OS.SIF_PAGE | OS.SIF_RANGE | OS.SIF_DISABLENOSCROLL; | |
info.nPos = selection; | |
info.nMin = minimum; | |
info.nMax = maximum; | |
info.nPage = thumb; | |
if (info.nPage != 0) info.nPage++; | |
OS.SetScrollInfo (handle, OS.SB_CTL, info, true); | |
/* | |
* Feature in Windows. Using SIF_DISABLENOSCROLL, | |
* SetScrollInfo () can change enabled and disabled | |
* state of the scroll bar causing a scroll bar that | |
* was disabled by the application to become enabled. | |
* The fix is to disable the scroll bar (again) when | |
* the application has disabled the scroll bar. | |
*/ | |
if ((state & DISABLED) != 0) { | |
if (OS.IsWinCE) { | |
OS.EnableWindow (handle, false); | |
} else { | |
OS.EnableScrollBar (handle, OS.SB_CTL, OS.ESB_DISABLE_BOTH); | |
} | |
} | |
/* | |
* Bug in Windows. If the thumb is resized when it has focus, | |
* the flashing cursor that is used to show that the scroll bar has | |
* focus is not moved. The fix is to post a fake WM_SETFOCUS to | |
* get the scroll bar to recompute the size of the flashing cursor. | |
*/ | |
if (OS.GetFocus () == handle) { | |
OS.PostMessage (handle, OS.WM_SETFOCUS, 0, 0); | |
} | |
} | |
int widgetExtStyle () { | |
/* | |
* Bug in Windows. If a scroll bar control is given a border, | |
* dragging the scroll bar thumb eats away parts of the border | |
* while the thumb is dragged. The fix is to clear WS_BORDER | |
* for all scroll bars. | |
*/ | |
int bits = super.widgetExtStyle (); | |
if ((style & SWT.BORDER) != 0) bits &= ~OS.WS_EX_CLIENTEDGE; | |
return bits; | |
} | |
int widgetStyle () { | |
int bits = super.widgetStyle () | OS.WS_TABSTOP; | |
/* | |
* Bug in Windows. If a scroll bar control is given a border, | |
* dragging the scroll bar thumb eats away parts of the border | |
* while the thumb is dragged. The fix is to clear WS_BORDER. | |
*/ | |
if ((style & SWT.BORDER) != 0) bits &= ~OS.WS_BORDER; | |
if ((style & SWT.HORIZONTAL) != 0) return bits | OS.SBS_HORZ; | |
return bits | OS.SBS_VERT; | |
} | |
TCHAR windowClass () { | |
return ScrollBarClass; | |
} | |
int windowProc () { | |
return ScrollBarProc; | |
} | |
LRESULT WM_LBUTTONDBLCLK (int wParam, int lParam) { | |
/* | |
* Feature in Windows. For some reason, capturing | |
* the mouse after processing WM_LBUTTONDBLCLK for the | |
* widget interferes with the normal mouse processing | |
* for the widget. The fix is to avoid the automatic | |
* mouse capture. | |
*/ | |
/* | |
* Feature in Windows. Windows uses the WS_TABSTOP | |
* style for the scroll bar to decide that focus | |
* should be set during WM_LBUTTONDBLCLK. This is | |
* not the desired behavior. The fix is to clear | |
* and restore WS_TABSTOP so that Windows will not | |
* assign focus. | |
*/ | |
int hwndCapture = OS.GetCapture (); | |
int oldBits = OS.GetWindowLong (handle, OS.GWL_STYLE); | |
int newBits = oldBits & ~OS.WS_TABSTOP; | |
OS.SetWindowLong (handle, OS.GWL_STYLE, newBits); | |
LRESULT result = super.WM_LBUTTONDBLCLK (wParam, lParam); | |
OS.SetWindowLong (handle, OS.GWL_STYLE, oldBits); | |
if (OS.GetCapture () != hwndCapture) OS.SetCapture (hwndCapture); | |
return result; | |
} | |
LRESULT WM_LBUTTONDOWN (int wParam, int lParam) { | |
/* | |
* Feature in Windows. For some reason, capturing | |
* the mouse after processing WM_LBUTTONDOWN for the | |
* widget interferes with the normal mouse processing | |
* for the widget. The fix is to avoid the automatic | |
* mouse capture. | |
*/ | |
/* | |
* Feature in Windows. Windows uses the WS_TABSTOP | |
* style for the scroll bar to decide that focus | |
* should be set during WM_LBUTTONDOWN. This is | |
* not the desired behavior. The fix is to clear | |
* and restore WS_TABSTOP so that Windows will not | |
* assign focus. | |
*/ | |
int hwndCapture = OS.GetCapture (); | |
int oldBits = OS.GetWindowLong (handle, OS.GWL_STYLE); | |
int newBits = oldBits & ~OS.WS_TABSTOP; | |
OS.SetWindowLong (handle, OS.GWL_STYLE, newBits); | |
LRESULT result = super.WM_LBUTTONDOWN (wParam, lParam); | |
OS.SetWindowLong (handle, OS.GWL_STYLE, oldBits); | |
if (OS.GetCapture () != hwndCapture) OS.SetCapture (hwndCapture); | |
return result; | |
} | |
LRESULT wmScrollChild (int wParam, int lParam) { | |
/* Do nothing when scrolling is ending */ | |
int code = wParam & 0xFFFF; | |
if (code == OS.SB_ENDSCROLL) return null; | |
/* Move the thumb */ | |
Event event = new Event (); | |
SCROLLINFO info = new SCROLLINFO (); | |
info.cbSize = SCROLLINFO.sizeof; | |
info.fMask = OS.SIF_TRACKPOS | OS.SIF_POS | OS.SIF_RANGE; | |
OS.GetScrollInfo (handle, OS.SB_CTL, info); | |
info.fMask = OS.SIF_POS; | |
switch (code) { | |
case OS.SB_THUMBPOSITION: | |
/* | |
* Do not set the detail field to DRAG to | |
* indicate that the dragging has ended. | |
*/ | |
info.nPos = info.nTrackPos; | |
break; | |
case OS.SB_THUMBTRACK: | |
event.detail = SWT.DRAG; | |
info.nPos = info.nTrackPos; | |
break; | |
case OS.SB_TOP: | |
event.detail = SWT.HOME; | |
info.nPos = info.nMin; | |
break; | |
case OS.SB_BOTTOM: | |
event.detail = SWT.END; | |
info.nPos = info.nMax; | |
break; | |
case OS.SB_LINEDOWN: | |
event.detail = SWT.ARROW_DOWN; | |
info.nPos += increment; | |
break; | |
case OS.SB_LINEUP: | |
event.detail = SWT.ARROW_UP; | |
info.nPos = Math.max (info.nMin, info.nPos - increment); | |
break; | |
case OS.SB_PAGEDOWN: | |
event.detail = SWT.PAGE_DOWN; | |
info.nPos += pageIncrement; | |
break; | |
case OS.SB_PAGEUP: | |
event.detail = SWT.PAGE_UP; | |
info.nPos = Math.max (info.nMin, info.nPos - pageIncrement); | |
break; | |
} | |
OS.SetScrollInfo (handle, OS.SB_CTL, info, true); | |
/* | |
* 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); | |
// the widget could be destroyed at this point | |
return null; | |
} | |
} |