/**
* Sets the receiver's caret.
*
* <p>The caret for the control is automatically hidden and shown when the control is painted or
* resized, when focus is gained or lost and when an the control is scrolled. To avoid drawing on
* top of the caret, the programmer must hide and show the caret when drawing in the window any
* other time.
*
* @param caret the new caret for the receiver, may be null
* @exception IllegalArgumentException
* <ul>
* <li>ERROR_INVALID_ARGUMENT - if the caret has been disposed
* </ul>
*
* @exception SWTException
* <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
* </ul>
*/
public void setCaret(Caret caret) {
checkWidget();
Caret newCaret = caret;
Caret oldCaret = this.caret;
this.caret = newCaret;
if (hasFocus()) {
if (oldCaret != null) oldCaret.killFocus();
if (newCaret != null) {
if (newCaret.isDisposed()) error(SWT.ERROR_INVALID_ARGUMENT);
newCaret.setFocus();
}
}
}
@Override
long /*int*/ windowProc(long /*int*/ hwnd, int msg, long /*int*/ wParam, long /*int*/ lParam) {
if (msg == Display.SWT_RESTORECARET) {
if ((state & CANVAS) != 0) {
if (caret != null) {
caret.killFocus();
caret.setFocus();
return 1;
}
}
}
return super.windowProc(hwnd, msg, wParam, lParam);
}
@Override
LRESULT WM_WINDOWPOSCHANGED(long /*int*/ wParam, long /*int*/ lParam) {
LRESULT result = super.WM_WINDOWPOSCHANGED(wParam, lParam);
// if (result != null) return result;
/*
* Bug in Windows. When a window with style WS_EX_LAYOUTRTL
* that contains a caret is resized, Windows does not move the
* caret in relation to the mirrored origin in the top right.
* The fix is to hide the caret in WM_WINDOWPOSCHANGING and
* show the caret in WM_WINDOWPOSCHANGED.
*/
boolean isFocus = (style & SWT.RIGHT_TO_LEFT) != 0 && caret != null && caret.isFocusCaret();
if (isFocus) caret.setFocus();
return result;
}
@Override
LRESULT WM_SETFOCUS(long /*int*/ wParam, long /*int*/ lParam) {
LRESULT result = super.WM_SETFOCUS(wParam, lParam);
if (caret != null && caret.isFocusCaret()) caret.setFocus();
return result;
}
void scrollInPixels(int destX, int destY, int x, int y, int width, int height, boolean all) {
forceResize();
boolean isFocus = caret != null && caret.isFocusCaret();
if (isFocus) caret.killFocus();
RECT sourceRect = new RECT();
OS.SetRect(sourceRect, x, y, x + width, y + height);
RECT clientRect = new RECT();
OS.GetClientRect(handle, clientRect);
if (OS.IntersectRect(clientRect, sourceRect, clientRect)) {
if (OS.IsWinCE) {
OS.UpdateWindow(handle);
} else {
int flags = OS.RDW_UPDATENOW | OS.RDW_ALLCHILDREN;
OS.RedrawWindow(handle, null, 0, flags);
}
}
int deltaX = destX - x, deltaY = destY - y;
if (findImageControl() != null) {
if (OS.IsWinCE) {
OS.InvalidateRect(handle, sourceRect, true);
} else {
int flags = OS.RDW_ERASE | OS.RDW_FRAME | OS.RDW_INVALIDATE;
if (all) flags |= OS.RDW_ALLCHILDREN;
OS.RedrawWindow(handle, sourceRect, 0, flags);
}
OS.OffsetRect(sourceRect, deltaX, deltaY);
if (OS.IsWinCE) {
OS.InvalidateRect(handle, sourceRect, true);
} else {
int flags = OS.RDW_ERASE | OS.RDW_FRAME | OS.RDW_INVALIDATE;
if (all) flags |= OS.RDW_ALLCHILDREN;
OS.RedrawWindow(handle, sourceRect, 0, flags);
}
} else {
int flags = OS.SW_INVALIDATE | OS.SW_ERASE;
/*
* Feature in Windows. If any child in the widget tree partially
* intersects the scrolling rectangle, Windows moves the child
* and copies the bits that intersect the scrolling rectangle but
* does not redraw the child.
*
* Feature in Windows. When any child in the widget tree does not
* intersect the scrolling rectangle but the parent does intersect,
* Windows does not move the child. This is the documented (but
* strange) Windows behavior.
*
* The fix is to not use SW_SCROLLCHILDREN and move the children
* explicitly after scrolling.
*/
// if (all) flags |= OS.SW_SCROLLCHILDREN;
OS.ScrollWindowEx(handle, deltaX, deltaY, sourceRect, null, 0, null, flags);
}
if (all) {
Control[] children = _getChildren();
for (int i = 0; i < children.length; i++) {
Control child = children[i];
Rectangle rect = child.getBoundsInPixels();
if (Math.min(x + width, rect.x + rect.width) >= Math.max(x, rect.x)
&& Math.min(y + height, rect.y + rect.height) >= Math.max(y, rect.y)) {
child.setLocationInPixels(rect.x + deltaX, rect.y + deltaY);
}
}
}
if (isFocus) caret.setFocus();
}