func (wb *WindowBase) setAndClearStyleBits(set, clear uint32) error {
style := uint32(win.GetWindowLong(wb.hWnd, win.GWL_STYLE))
if style == 0 {
return lastError("GetWindowLong")
}
if newStyle := style&^clear | set; newStyle != style {
win.SetLastError(0)
if win.SetWindowLong(wb.hWnd, win.GWL_STYLE, int32(newStyle)) == 0 {
return lastError("SetWindowLong")
}
}
return nil
}
func (fb *FormBase) SetOwner(value Form) error {
fb.owner = value
var ownerHWnd win.HWND
if value != nil {
ownerHWnd = value.Handle()
}
win.SetLastError(0)
if 0 == win.SetWindowLong(
fb.hWnd,
win.GWL_HWNDPARENT,
int32(ownerHWnd)) && win.GetLastError() != 0 {
return lastError("SetWindowLong")
}
return nil
}
func (tw *TabWidget) removePage(page *TabPage) (err error) {
page.SetVisible(false)
style := uint32(win.GetWindowLong(page.hWnd, win.GWL_STYLE))
if style == 0 {
return lastError("GetWindowLong")
}
style &^= win.WS_CHILD
style |= win.WS_POPUP
win.SetLastError(0)
if win.SetWindowLong(page.hWnd, win.GWL_STYLE, int32(style)) == 0 {
return lastError("SetWindowLong")
}
page.tabWidget = nil
return page.SetParent(nil)
}
func (tw *TabWidget) onInsertedPage(index int, page *TabPage) (err error) {
item := tw.tcitemFromPage(page)
if idx := int(win.SendMessage(tw.hWndTab, win.TCM_INSERTITEM, uintptr(index), uintptr(unsafe.Pointer(item)))); idx == -1 {
return newError("SendMessage(TCM_INSERTITEM) failed")
}
page.SetVisible(false)
style := uint32(win.GetWindowLong(page.hWnd, win.GWL_STYLE))
if style == 0 {
return lastError("GetWindowLong")
}
style |= win.WS_CHILD
style &^= win.WS_POPUP
win.SetLastError(0)
if win.SetWindowLong(page.hWnd, win.GWL_STYLE, int32(style)) == 0 {
return lastError("SetWindowLong")
}
if win.SetParent(page.hWnd, tw.hWnd) == 0 {
return lastError("SetParent")
}
if tw.pages.Len() == 1 {
page.SetVisible(true)
tw.SetCurrentIndex(0)
}
tw.resizePages()
page.tabWidget = tw
page.applyFont(tw.Font())
return
}
// SetParent sets the parent of the WidgetBase and adds the WidgetBase to the
// Children list of the Container.
func (wb *WidgetBase) SetParent(parent Container) (err error) {
if parent == wb.parent {
return nil
}
style := uint32(win.GetWindowLong(wb.hWnd, win.GWL_STYLE))
if style == 0 {
return lastError("GetWindowLong")
}
if parent == nil {
style &^= win.WS_CHILD
style |= win.WS_POPUP
if win.SetParent(wb.hWnd, 0) == 0 {
return lastError("SetParent")
}
win.SetLastError(0)
if win.SetWindowLong(wb.hWnd, win.GWL_STYLE, int32(style)) == 0 {
return lastError("SetWindowLong")
}
} else {
style |= win.WS_CHILD
style &^= win.WS_POPUP
win.SetLastError(0)
if win.SetWindowLong(wb.hWnd, win.GWL_STYLE, int32(style)) == 0 {
return lastError("SetWindowLong")
}
if win.SetParent(wb.hWnd, parent.Handle()) == 0 {
return lastError("SetParent")
}
}
b := wb.Bounds()
if !win.SetWindowPos(
wb.hWnd,
win.HWND_BOTTOM,
int32(b.X),
int32(b.Y),
int32(b.Width),
int32(b.Height),
win.SWP_FRAMECHANGED) {
return lastError("SetWindowPos")
}
oldParent := wb.parent
wb.parent = parent
var oldChildren, newChildren *WidgetList
if oldParent != nil {
oldChildren = oldParent.Children()
}
if parent != nil {
newChildren = parent.Children()
}
if newChildren == oldChildren {
return nil
}
widget := wb.window.(Widget)
if oldChildren != nil {
oldChildren.Remove(widget)
}
if newChildren != nil && !newChildren.containsHandle(wb.hWnd) {
newChildren.Add(widget)
}
return nil
}