// Draws the 'x' close button in regular state or onhover state
// Tries to mimic visual style of Chrome tab close button
static void DrawCloseButton(HDC hdc, LabelWithCloseWnd *w) {
Graphics g(hdc);
g.SetCompositingQuality(CompositingQualityHighQuality);
g.SetSmoothingMode(SmoothingModeAntiAlias);
g.SetPageUnit(UnitPixel);
// GDI+ doesn't pick up the window's orientation through the device context,
// so we have to explicitly mirror all rendering horizontally
if (IsRtl(w->hwnd)) {
g.ScaleTransform(-1, 1);
g.TranslateTransform((REAL)ClientRect(w->hwnd).dx, 0, MatrixOrderAppend);
}
Color c;
RectI &r = w->closeBtnPos;
// in onhover state, background is a red-ish circle
bool onHover = IsMouseOverClose(w);
if (onHover) {
c.SetFromCOLORREF(COL_CLOSE_HOVER_BG);
SolidBrush b(c);
g.FillEllipse(&b, r.x, r.y, r.dx - 2, r.dy - 2);
}
// draw 'x'
c.SetFromCOLORREF(onHover ? COL_CLOSE_X_HOVER : COL_CLOSE_X);
g.TranslateTransform((float)r.x, (float)r.y);
Pen p(c, 2);
if (onHover) {
g.DrawLine(&p, Point(4, 4), Point(r.dx - 6, r.dy - 6));
g.DrawLine(&p, Point(r.dx - 6, 4), Point(4, r.dy - 6));
} else {
g.DrawLine(&p, Point(4, 5), Point(r.dx - 6, r.dy - 5));
g.DrawLine(&p, Point(r.dx - 6, 5), Point(4, r.dy - 5));
}
}
static void PaintHDC(LabelWithCloseWnd *w, HDC hdc, const PAINTSTRUCT& ps)
{
HBRUSH br = CreateSolidBrush(w->bgCol);
FillRect(hdc, &ps.rcPaint, br);
ClientRect cr(w->hwnd);
int x = win::DpiAdjust(w->hwnd, w->padL);
int y = win::DpiAdjust(w->hwnd, w->padT);
UINT opts = ETO_OPAQUE;
if (IsRtl(w->hwnd)) {
opts = opts | ETO_RTLREADING;
}
HGDIOBJ prevFont = NULL;
if (w->font) {
prevFont = SelectObject(hdc, w->font);
}
SetTextColor(hdc, w->txtCol);
SetBkColor(hdc, w->bgCol);
WCHAR *s = win::GetText(w->hwnd);
ExtTextOut(hdc, x, y, opts, NULL, s, (UINT)str::Len(s), NULL);
free(s);
// Text might be too long and invade close button area. We just re-paint
// the background, which is not the pretties but works.
// A better way would be to intelligently truncate text or shrink the font
// size (within reason)
x = w->closeBtnPos.x - win::DpiAdjust(w->hwnd, LABEL_BUTTON_SPACE_DX);
RectI ri(x, 0, cr.dx - x, cr.dy);
RECT r = ri.ToRECT();
FillRect(hdc, &r, br);
DrawCloseButton(hdc, w->closeBtnPos, IsMouseOverClose(w));
DeleteObject(br);
if (w->font) {
SelectObject(hdc, prevFont);
}
}
static LRESULT CALLBACK WndProcLabelWithClose(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp) {
if (WM_ERASEBKGND == msg) {
return TRUE; // tells Windows we handle background erasing so it doesn't do it
}
LabelWithCloseWnd *w = nullptr;
if (WM_NCCREATE == msg) {
LPCREATESTRUCT lpcs = reinterpret_cast<LPCREATESTRUCT>(lp);
w = reinterpret_cast<LabelWithCloseWnd *>(lpcs->lpCreateParams);
w->hwnd = hwnd;
SetWindowLongPtr(hwnd, GWLP_USERDATA, reinterpret_cast<LPARAM>(w));
goto DoDefault;
} else {
w = reinterpret_cast<LabelWithCloseWnd *>(GetWindowLongPtr(hwnd, GWLP_USERDATA));
}
if (!w) {
goto DoDefault;
}
// to match other controls, preferred way is explict SetFont() call
if (WM_SETFONT == msg) {
SetFont(w, (HFONT)wp);
return 0;
}
if (WM_GETFONT == msg) {
return (LRESULT)w->font;
}
if (WM_SIZE == msg) {
int dx = LOWORD(lp);
int dy = HIWORD(lp);
CalcCloseButtonPos(w, dx, dy);
ScheduleRepaint(hwnd);
return 0;
}
if (WM_MOUSEMOVE == msg) {
ScheduleRepaint(w->hwnd);
if (IsMouseOverClose(w)) {
// ask for WM_MOUSELEAVE notifications
TRACKMOUSEEVENT tme = { 0 };
tme.cbSize = sizeof(tme);
tme.dwFlags = TME_LEAVE;
tme.hwndTrack = hwnd;
TrackMouseEvent(&tme);
}
goto DoDefault;
}
if (WM_MOUSELEAVE == msg) {
ScheduleRepaint(w->hwnd);
return 0;
}
if (WM_LBUTTONUP == msg) {
if (IsMouseOverClose(w)) {
HWND parent = GetParent(w->hwnd);
SendMessage(parent, WM_COMMAND, w->cmd, 0);
}
return 0;
}
if (WM_PAINT == msg) {
OnPaint(w);
return 0;
}
DoDefault:
return DefWindowProc(hwnd, msg, wp, lp);
}
