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// Copyright 2011 The Walk Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build windows
package walk
import (
"image"
"path/filepath"
"syscall"
)
import (
"github.com/lxn/win"
)
// Icon is a bitmap that supports transparency and combining multiple
// variants of an image in different resolutions.
type Icon struct {
hIcon win.HICON
isStock bool
}
func IconApplication() *Icon {
return &Icon{win.LoadIcon(0, win.MAKEINTRESOURCE(win.IDI_APPLICATION)), true}
}
func IconError() *Icon {
return &Icon{win.LoadIcon(0, win.MAKEINTRESOURCE(win.IDI_ERROR)), true}
}
func IconQuestion() *Icon {
return &Icon{win.LoadIcon(0, win.MAKEINTRESOURCE(win.IDI_QUESTION)), true}
}
func IconWarning() *Icon {
return &Icon{win.LoadIcon(0, win.MAKEINTRESOURCE(win.IDI_WARNING)), true}
}
func IconInformation() *Icon {
return &Icon{win.LoadIcon(0, win.MAKEINTRESOURCE(win.IDI_INFORMATION)), true}
}
func IconWinLogo() *Icon {
return &Icon{win.LoadIcon(0, win.MAKEINTRESOURCE(win.IDI_WINLOGO)), true}
}
func IconShield() *Icon {
return &Icon{win.LoadIcon(0, win.MAKEINTRESOURCE(win.IDI_SHIELD)), true}
}
// NewIconFromFile returns a new Icon, using the specified icon image file.
func NewIconFromFile(filePath string) (*Icon, error) {
absFilePath, err := filepath.Abs(filePath)
if err != nil {
return nil, wrapError(err)
}
hIcon := win.HICON(win.LoadImage(
0,
syscall.StringToUTF16Ptr(absFilePath),
win.IMAGE_ICON,
0,
0,
win.LR_DEFAULTSIZE|win.LR_LOADFROMFILE))
if hIcon == 0 {
return nil, lastError("LoadImage")
}
return &Icon{hIcon: hIcon}, nil
}
// NewIconFromResource returns a new Icon, using the specified icon resource.
func NewIconFromResource(name string) (*Icon, error) {
return newIconFromResource(syscall.StringToUTF16Ptr(name))
}
func NewIconFromResourceId(id int) (*Icon, error) {
return newIconFromResource(win.MAKEINTRESOURCE(uintptr(id)))
}
func newIconFromResource(res *uint16) (ic *Icon, err error) {
hInst := win.GetModuleHandle(nil)
if hInst == 0 {
err = lastError("GetModuleHandle")
return
}
if hIcon := win.LoadIcon(hInst, res); hIcon == 0 {
err = lastError("LoadIcon")
} else {
ic = &Icon{hIcon: hIcon}
}
return
}
func NewIconFromImage(im image.Image) (ic *Icon, err error) {
hIcon, err := createAlphaCursorOrIconFromImage(im, image.Pt(0, 0), true)
if err != nil {
return nil, err
}
return &Icon{hIcon: hIcon}, nil
}
func NewIconFromHICON(hIcon win.HICON) (ic *Icon, err error) {
return &Icon{hIcon: hIcon}, nil
}
// Dispose releases the operating system resources associated with the Icon.
func (i *Icon) Dispose() {
if i.isStock || i.hIcon == 0 {
return
}
win.DestroyIcon(i.hIcon)
i.hIcon = 0
}
func (i *Icon) draw(hdc win.HDC, location Point) error {
s := i.Size()
return i.drawStretched(hdc, Rectangle{location.X, location.Y, s.Width, s.Height})
}
func (i *Icon) drawStretched(hdc win.HDC, bounds Rectangle) error {
if !win.DrawIconEx(hdc, int32(bounds.X), int32(bounds.Y), i.hIcon, int32(bounds.Width), int32(bounds.Height), 0, 0, win.DI_NORMAL) {
return lastError("DrawIconEx")
}
return nil
}
func (i *Icon) Size() Size {
return Size{int(win.GetSystemMetrics(win.SM_CXICON)), int(win.GetSystemMetrics(win.SM_CYICON))}
}
// create an Alpha Icon or Cursor from an Image
// http://support.microsoft.com/kb/318876
func createAlphaCursorOrIconFromImage(im image.Image, hotspot image.Point, fIcon bool) (win.HICON, error) {
hBitmap, err := hBitmapFromImage(im)
if err != nil {
return 0, err
}
defer win.DeleteObject(win.HGDIOBJ(hBitmap))
// Create an empty mask bitmap.
hMonoBitmap := win.CreateBitmap(int32(im.Bounds().Dx()), int32(im.Bounds().Dy()), 1, 1, nil)
if hMonoBitmap == 0 {
return 0, newError("CreateBitmap failed")
}
defer win.DeleteObject(win.HGDIOBJ(hMonoBitmap))
var ii win.ICONINFO
if fIcon {
ii.FIcon = win.TRUE
}
ii.XHotspot = uint32(hotspot.X)
ii.YHotspot = uint32(hotspot.Y)
ii.HbmMask = hMonoBitmap
ii.HbmColor = hBitmap
// Create the alpha cursor with the alpha DIB section.
hIconOrCursor := win.CreateIconIndirect(&ii)
return hIconOrCursor, nil
}
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