func (this *Canvas) DrawRect(rect *Rect, pen *Pen, brush *Brush) {
w32Rect := rect.GetW32Rect()
previousPen := w32.SelectObject(this.hdc, w32.HGDIOBJ(pen.GetHPEN()))
defer w32.SelectObject(this.hdc, previousPen)
previousBrush := w32.SelectObject(this.hdc, w32.HGDIOBJ(brush.GetHBRUSH()))
defer w32.SelectObject(this.hdc, previousBrush)
w32.Rectangle(this.hdc, int(w32Rect.Left), int(w32Rect.Top), int(w32Rect.Right), int(w32Rect.Bottom))
}
func (this *Canvas) DrawBitmap(bmp *Bitmap, x, y int) {
cdc := w32.CreateCompatibleDC(0)
defer w32.DeleteDC(cdc)
hbmpOld := w32.SelectObject(cdc, w32.HGDIOBJ(bmp.GetHBITMAP()))
defer w32.SelectObject(cdc, w32.HGDIOBJ(hbmpOld))
w, h := bmp.Size()
w32.BitBlt(this.hdc, x, y, w, h, cdc, 0, 0, w32.SRCCOPY)
}
// Refer win32 DrawText document for uFormat.
func (this *Canvas) DrawText(text string, rect *Rect, format uint, font *Font, textColor Color) {
previousFont := w32.SelectObject(this.hdc, w32.HGDIOBJ(font.GetHFONT()))
defer w32.SelectObject(this.hdc, w32.HGDIOBJ(previousFont))
previousBkMode := w32.SetBkMode(this.hdc, w32.TRANSPARENT)
defer w32.SetBkMode(this.hdc, previousBkMode)
previousTextColor := w32.SetTextColor(this.hdc, w32.COLORREF(textColor))
defer w32.SetTextColor(this.hdc, previousTextColor)
w32.DrawText(this.hdc, text, len(text), rect.GetW32Rect(), format)
}
func (this *Canvas) DrawStretchedBitmap(bmp *Bitmap, rect *Rect) {
cdc := w32.CreateCompatibleDC(0)
defer w32.DeleteDC(cdc)
hbmpOld := w32.SelectObject(cdc, w32.HGDIOBJ(bmp.GetHBITMAP()))
defer w32.SelectObject(cdc, w32.HGDIOBJ(hbmpOld))
w, h := bmp.Size()
rc := rect.GetW32Rect()
w32.StretchBlt(this.hdc, int(rc.Left), int(rc.Top), int(rc.Right), int(rc.Bottom), cdc, 0, 0, w, h, w32.SRCCOPY)
}
// SetColor sets the drawing color of the window.
func (win *window) SetColor(p sparta.Property, c color.RGBA) {
if (p != sparta.Background) && (p != sparta.Foreground) {
return
}
if win.dc == 0 {
return
}
b := getBrush(c)
if p == sparta.Foreground {
w32.SelectObject(win.dc, w32.HGDIOBJ(b.brush))
w32.SelectObject(win.dc, w32.HGDIOBJ(b.pen))
w32.SetTextColor(win.dc, b.color)
win.curr = b
} else {
w32.SetBkColor(win.dc, b.color)
}
}
// Draw sets the drawing mode of the window.
func (win *window) Draw(mode bool) {
if win.isPaint {
return
}
if mode {
if win.dc != 0 {
return
}
win.dc = w32.GetDC(win.id)
w32.SetBkMode(win.dc, w32.TRANSPARENT)
w32.SetBkColor(win.dc, win.back.color)
w32.SelectObject(win.dc, w32.HGDIOBJ(win.fore.brush))
w32.SelectObject(win.dc, w32.HGDIOBJ(win.fore.pen))
w32.SelectObject(win.dc, w32.HGDIOBJ(winFont))
w32.SetTextColor(win.dc, win.fore.color)
win.curr = win.fore
return
}
if win.dc == 0 {
return
}
w32.ReleaseDC(win.id, win.dc)
win.dc = 0
}
// WinEvent proccess a win32 event.
func winEvent(id w32.HWND, event uint32, wParam, lParam uintptr) uintptr {
w, ok := widgetTable[id]
if !ok {
return w32.DefWindowProc(id, event, wParam, lParam)
}
switch event {
case w32.WM_CHAR:
r := utf16.Decode([]uint16{uint16(loWord(uint32(wParam)))})
if len(r) == 0 {
break
}
key := r[0]
if key == 0 {
break
}
if (key == '\b') || (key == '\t') || (key == '\n') || (key == '\r') {
break
}
ev := sparta.KeyEvent{
Key: sparta.Key(key),
State: getState(),
}
x, y, _ := w32.GetCursorPos()
ev.Loc.X, ev.Loc.Y, _ = w32.ScreenToClient(id, x, y)
w.OnEvent(ev)
case w32.WM_CLOSE:
if w.Property(sparta.Parent) != nil {
break
}
w.OnEvent(sparta.CloseEvent{})
case w32.WM_KEYDOWN:
key := getKeyValue(wParam)
if key == 0 {
break
}
if (key & sparta.KeyNoChar) == 0 {
break
}
ev := sparta.KeyEvent{
Key: key,
State: getState(),
}
x, y, _ := w32.GetCursorPos()
ev.Loc.X, ev.Loc.Y, _ = w32.ScreenToClient(id, x, y)
w.OnEvent(ev)
case w32.WM_KEYUP:
key := getKeyValue(wParam)
if key == 0 {
break
}
ev := sparta.KeyEvent{
Key: -key,
State: getState(),
}
x, y, _ := w32.GetCursorPos()
ev.Loc.X, ev.Loc.Y, _ = w32.ScreenToClient(id, x, y)
w.OnEvent(ev)
case w32.WM_LBUTTONDOWN, w32.WM_RBUTTONDOWN, w32.WM_MBUTTONDOWN:
ev := sparta.MouseEvent{
Button: getButton(event),
State: getState(),
Loc: image.Pt(getXLParam(lParam), getYLParam(lParam)),
}
w.OnEvent(ev)
w.Focus()
case w32.WM_LBUTTONUP, w32.WM_RBUTTONUP, w32.WM_MBUTTONUP:
ev := sparta.MouseEvent{
Button: -getButton(event),
State: getState(),
Loc: image.Pt(getXLParam(lParam), getYLParam(lParam)),
}
w.OnEvent(ev)
case w32.WM_MOUSEMOVE:
ev := sparta.MouseEvent{
Loc: image.Pt(getXLParam(lParam), getYLParam(lParam)),
}
w.OnEvent(ev)
case w32.WM_MOUSEWHEEL:
ev := sparta.MouseEvent{
Button: sparta.MouseWheel,
}
if getWheelDeltaWParam(wParam) < 0 {
ev.Button = -sparta.MouseWheel
}
ev.Loc.X, ev.Loc.Y, _ = w32.ScreenToClient(id, getXLParam(lParam), getYLParam(lParam))
w = propagateWheel(w, ev.Loc)
w.OnEvent(ev)
case w32.WM_MOVE:
win := w.Window().(*window)
win.pos.X, win.pos.Y = int(loWord(uint32(lParam))), int(hiWord(uint32(lParam)))
case w32.WM_PAINT:
win := w.Window().(*window)
ps := &w32.PAINTSTRUCT{}
win.dc = w32.BeginPaint(id, ps)
win.isPaint = true
w32.SetBkMode(win.dc, w32.TRANSPARENT)
w32.SetBkColor(win.dc, win.back.color)
// "clear" the area
w32.SelectObject(win.dc, w32.HGDIOBJ(win.back.brush))
w32.SelectObject(win.dc, w32.HGDIOBJ(win.back.pen))
w32.Rectangle(win.dc, int(ps.RcPaint.Left), int(ps.RcPaint.Top), int(ps.RcPaint.Right), int(ps.RcPaint.Bottom))
w32.SelectObject(win.dc, w32.HGDIOBJ(win.fore.brush))
w32.SelectObject(win.dc, w32.HGDIOBJ(win.fore.pen))
w32.SelectObject(win.dc, w32.HGDIOBJ(winFont))
w32.SetTextColor(win.dc, win.fore.color)
win.curr = win.fore
ev := sparta.ExposeEvent{image.Rect(int(ps.RcPaint.Left), int(ps.RcPaint.Top), int(ps.RcPaint.Right), int(ps.RcPaint.Bottom))}
w.OnEvent(ev)
w32.EndPaint(id, ps)
win.isPaint = false
win.dc = 0
case w32.WM_SIZE:
win := w.Window().(*window)
ev := sparta.ConfigureEvent{image.Rect(win.pos.X, win.pos.Y, win.pos.X+int(loWord(uint32(lParam))), win.pos.Y+int(hiWord(uint32(lParam))))}
w.OnEvent(ev)
case w32.WM_USER:
src, ok := widgetTable[w32.HWND(wParam)]
if !ok {
src = nil
}
ev := sparta.CommandEvent{
Source: src,
Value: int(int32(lParam)),
}
w.OnEvent(ev)
default:
return w32.DefWindowProc(id, event, wParam, lParam)
}
return 0
}
func CaptureRect(rect image.Rectangle) (*image.RGBA, error) {
hDC := w32.GetDC(0)
if hDC == 0 {
return nil, fmt.Errorf("Could not Get primary display err:%d.\n", w32.GetLastError())
}
defer w32.ReleaseDC(0, hDC)
m_hDC := w32.CreateCompatibleDC(hDC)
if m_hDC == 0 {
return nil, fmt.Errorf("Could not Create Compatible DC err:%d.\n", w32.GetLastError())
}
defer w32.DeleteDC(m_hDC)
x, y := rect.Dx(), rect.Dy()
bt := w32.BITMAPINFO{}
bt.BmiHeader.BiSize = uint(reflect.TypeOf(bt.BmiHeader).Size())
bt.BmiHeader.BiWidth = x
bt.BmiHeader.BiHeight = -y
bt.BmiHeader.BiPlanes = 1
bt.BmiHeader.BiBitCount = 32
bt.BmiHeader.BiCompression = w32.BI_RGB
ptr := unsafe.Pointer(uintptr(0))
m_hBmp := w32.CreateDIBSection(m_hDC, &bt, w32.DIB_RGB_COLORS, &ptr, 0, 0)
if m_hBmp == 0 {
return nil, fmt.Errorf("Could not Create DIB Section err:%d.\n", w32.GetLastError())
}
if m_hBmp == w32.InvalidParameter {
return nil, fmt.Errorf("One or more of the input parameters is invalid while calling CreateDIBSection.\n")
}
defer w32.DeleteObject(w32.HGDIOBJ(m_hBmp))
obj := w32.SelectObject(m_hDC, w32.HGDIOBJ(m_hBmp))
if obj == 0 {
return nil, fmt.Errorf("error occurred and the selected object is not a region err:%d.\n", w32.GetLastError())
}
if obj == 0xffffffff { //GDI_ERROR
return nil, fmt.Errorf("GDI_ERROR while calling SelectObject err:%d.\n", w32.GetLastError())
}
defer w32.DeleteObject(obj)
//Note:BitBlt contains bad error handling, we will just assume it works and if it doesn't it will panic :x
w32.BitBlt(m_hDC, 0, 0, x, y, hDC, rect.Min.X, rect.Min.Y, w32.SRCCOPY)
var slice []byte
hdrp := (*reflect.SliceHeader)(unsafe.Pointer(&slice))
hdrp.Data = uintptr(ptr)
hdrp.Len = x * y * 4
hdrp.Cap = x * y * 4
imageBytes := make([]byte, len(slice))
for i := 0; i < len(imageBytes); i += 4 {
imageBytes[i], imageBytes[i+2], imageBytes[i+1], imageBytes[i+3] = slice[i+2], slice[i], slice[i+1], slice[i+3]
}
img := &image.RGBA{imageBytes, 4 * x, image.Rect(0, 0, x, y)}
return img, nil
}
