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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
*/
package ui
import (
"fmt"
"github.com/lxn/walk"
"github.com/lxn/win"
"golang.org/x/sys/windows"
"golang.zx2c4.com/wireguard/windows/service"
"path"
)
type rectAndState struct {
size walk.Rectangle
state service.TunnelState
}
type IconProvider struct {
wireguardIcon *walk.Icon
imagesByRectAndState map[rectAndState]*walk.Bitmap
iconsByState map[service.TunnelState]*walk.Icon
updateAvailabeImage *walk.Bitmap
scale float64
}
func NewIconProvider(dpi int) (*IconProvider, error) {
tsip := &IconProvider{
imagesByRectAndState: make(map[rectAndState]*walk.Bitmap),
iconsByState: make(map[service.TunnelState]*walk.Icon),
scale: float64(dpi) / 96.0,
}
var err error
var disposables walk.Disposables
defer disposables.Treat()
if tsip.wireguardIcon, err = walk.NewIconFromResource("$wireguard.ico"); err != nil {
return nil, err
}
disposables.Add(tsip.wireguardIcon)
disposables.Spare()
return tsip, nil
}
func (tsip *IconProvider) Dispose() {
if tsip.imagesByRectAndState != nil {
for _, img := range tsip.imagesByRectAndState {
img.Dispose()
}
tsip.imagesByRectAndState = nil
}
if tsip.iconsByState != nil {
for _, icon := range tsip.iconsByState {
icon.Dispose()
}
tsip.iconsByState = nil
}
if tsip.wireguardIcon != nil {
tsip.wireguardIcon.Dispose()
tsip.wireguardIcon = nil
}
if tsip.updateAvailabeImage != nil {
tsip.updateAvailabeImage.Dispose()
tsip.updateAvailabeImage = nil
}
}
func (tsip *IconProvider) scaleForDPI(i int) int {
return int(tsip.scale * float64(i))
}
func (tsip *IconProvider) UpdateAvailableImage() (*walk.Bitmap, error) {
if tsip.updateAvailabeImage != nil {
return tsip.updateAvailabeImage, nil
}
const size = 16 //TODO: this should use dynamic DPI, but we don't due to a walk bug with tab icons.
redDot, err := walk.NewIconFromResourceWithSize("dot-red.ico", walk.Size{size, size})
if err != nil {
return nil, err
}
defer redDot.Dispose()
img, err := walk.NewBitmapWithTransparentPixels(walk.Size{size, size})
if err != nil {
return nil, err
}
canvas, err := walk.NewCanvasFromImage(img)
if err != nil {
img.Dispose()
return nil, err
}
defer canvas.Dispose()
// This should be scaled for DPI but instead we do the opposite, due to a walk bug with tab icons.
margin := int(3.0 - (tsip.scale-1.0)*3.0)
if margin < 0 {
margin = 0
}
rect := walk.Rectangle{margin, margin, size - margin*2, size - margin*2}
if err := canvas.DrawImageStretched(redDot, rect); err != nil {
img.Dispose()
return nil, err
}
tsip.updateAvailabeImage = img
return img, nil
}
func (tsip *IconProvider) ImageForTunnel(tunnel *service.Tunnel, size walk.Size) (*walk.Bitmap, error) {
state, err := tunnel.State()
if err != nil {
return nil, err
}
return tsip.ImageForState(state, walk.Rectangle{0, 0, size.Width, size.Height})
}
func (tsip *IconProvider) ImageForState(state service.TunnelState, rect walk.Rectangle) (*walk.Bitmap, error) {
key := rectAndState{rect, state}
if img, ok := tsip.imagesByRectAndState[key]; ok {
return img, nil
}
img, err := walk.NewBitmapWithTransparentPixels(rect.Size())
if err != nil {
return nil, err
}
canvas, err := walk.NewCanvasFromImage(img)
if err != nil {
return nil, err
}
defer canvas.Dispose()
if err := tsip.PaintForState(state, canvas, rect); err != nil {
return nil, err
}
tsip.imagesByRectAndState[key] = img
return img, nil
}
func (tsip *IconProvider) IconWithOverlayForState(state service.TunnelState) (*walk.Icon, error) {
if icon, ok := tsip.iconsByState[state]; ok {
return icon, nil
}
size := tsip.wireguardIcon.Size()
bmp, err := walk.NewBitmapWithTransparentPixels(size)
if err != nil {
return nil, err
}
defer bmp.Dispose()
canvas, err := walk.NewCanvasFromImage(bmp)
if err != nil {
return nil, err
}
defer canvas.Dispose()
if err := canvas.DrawImage(tsip.wireguardIcon, walk.Point{}); err != nil {
return nil, err
}
w := int(float64(size.Width) * 0.75)
h := int(float64(size.Height) * 0.75)
margin := tsip.scaleForDPI(2)
bounds := walk.Rectangle{margin + size.Width - w, margin + size.Height - h, w, h}
if err := tsip.PaintForState(state, canvas, bounds); err != nil {
return nil, err
}
canvas.Dispose()
icon, err := walk.NewIconFromBitmap(bmp)
if err != nil {
return nil, err
}
tsip.iconsByState[state] = icon
return icon, nil
}
func (tsip *IconProvider) PaintForTunnel(tunnel *service.Tunnel, canvas *walk.Canvas, bounds walk.Rectangle) error {
state, err := tunnel.State()
if err != nil {
return err
}
return tsip.PaintForState(state, canvas, bounds)
}
func (tsip *IconProvider) PaintForState(state service.TunnelState, canvas *walk.Canvas, bounds walk.Rectangle) error {
iconSize := tsip.scaleForDPI(bounds.Height)
var dot *walk.Icon
var err error
switch state {
case service.TunnelStarted:
dot, err = walk.NewIconFromResourceWithSize("dot-green.ico", walk.Size{iconSize, iconSize})
case service.TunnelStopped:
dot, err = walk.NewIconFromResourceWithSize("dot-gray.ico", walk.Size{iconSize, iconSize})
default:
dot, err = walk.NewIconFromResourceWithSize("dot-yellow.ico", walk.Size{iconSize, iconSize})
}
if err != nil {
return err
}
defer dot.Dispose()
b := bounds
b.X += tsip.scaleForDPI(2)
b.Y += tsip.scaleForDPI(2)
b.Height -= tsip.scaleForDPI(4)
b.Width = b.Height
if err := canvas.DrawImageStretched(dot, b); err != nil {
return err
}
return nil
}
func loadSystemIcon(dll string, index uint) (*walk.Icon, error) {
system32, err := windows.GetSystemDirectory()
if err != nil {
return nil, err
}
hicon := win.ExtractIcon(win.GetModuleHandle(nil), windows.StringToUTF16Ptr(path.Join(system32, dll+".dll")), int32(index))
if hicon <= 1 {
return nil, fmt.Errorf("Unable to find icon %d of %s", index, dll)
}
return walk.NewIconFromHICON(hicon)
}
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