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contextMenu.go
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contextMenu.go
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package mustard
import (
assets "github.com/danfragoso/thdwb/assets"
gg "github.com/danfragoso/thdwb/gg"
"image"
"github.com/goki/freetype/truetype"
)
func (window *Window) EnableContextMenus() {
window.contextMenu = &contextMenu{
overlay: &Overlay{
ref: "contextMenu",
},
}
}
func (window *Window) AddContextMenuEntry(entryText string, action func()) {
window.contextMenu.entries = append(
window.contextMenu.entries,
&menuEntry{
entryText: entryText,
action: action,
},
)
}
func (window *Window) DestroyContextMenu() {
window.RemoveOverlay(window.contextMenu.overlay)
window.contextMenu.entries = nil
window.contextMenu.selectedEntry = nil
window.SetCursor(DefaultCursor)
}
func prepEntry(ctx *gg.Context, entry string, width float64) string {
w, _ := ctx.MeasureString(entry)
if w < width {
return entry
}
for i := 0; i < len(entry); i++ {
nW, _ := ctx.MeasureString(entry[:len(entry)-i] + "...")
if nW <= width {
return entry[:len(entry)-i] + "..."
}
}
return entry
}
func (window *Window) DrawContextMenu() {
menuWidth := float64(200)
menuHeight := float64(len(window.contextMenu.entries) * 20)
menuTop := float64(window.cursorY)
menuLeft := float64(window.cursorX)
if menuLeft+menuWidth > float64(window.width) {
menuLeft = float64(window.width) - menuWidth
}
if menuTop+menuHeight > float64(window.height) {
menuTop = float64(window.height) - menuHeight
}
ctx := gg.NewContext(int(menuWidth), int(menuHeight))
ctx.DrawRectangle(0, 0, menuWidth, menuHeight)
ctx.SetHexColor("#eee")
ctx.Fill()
font, _ := truetype.Parse(assets.OpenSans(400))
ctx.SetHexColor("#222")
ctx.SetFont(font, 16)
textLeft := 4.
for idx, entry := range window.contextMenu.entries {
top, left := 16+float64(idx*20), 0.
entry.setCoords(menuTop+top-16, menuLeft+left, menuWidth, 20)
ctx.DrawString(prepEntry(ctx, entry.entryText, menuWidth-textLeft), textLeft, top)
ctx.Fill()
}
ctx.DrawRectangle(0, 0, menuWidth, menuHeight)
ctx.SetHexColor("#ddd")
ctx.Stroke()
overlay := extractOverlay(
ctx.Image().(*image.RGBA),
image.Point{
int(menuLeft),
int(menuTop),
})
window.SetContextMenuOverlay(overlay)
}
func (window *Window) SetContextMenuOverlay(overlay *Overlay) {
window.contextMenu.overlay = overlay
window.AddOverlay(overlay)
}
func (window *Window) refreshContextMenu() {
ctx := gg.NewContextForRGBA(window.contextMenu.overlay.buffer)
menuWidth := float64(window.contextMenu.overlay.buffer.Rect.Max.X)
textLeft := 4.
ctx.SetHexColor("#eee")
ctx.Clear()
font, _ := truetype.Parse(assets.OpenSans(400))
ctx.SetHexColor("#222")
ctx.SetFont(font, 16)
for idx, entry := range window.contextMenu.entries {
if window.contextMenu.selectedEntry == entry {
ctx.DrawRectangle(0, float64(idx*20), menuWidth, 20)
ctx.SetHexColor("#ccc")
ctx.Fill()
}
ctx.SetHexColor("#222")
ctx.DrawString(prepEntry(ctx, entry.entryText, menuWidth-textLeft), textLeft, 16+float64(idx*20))
ctx.Fill()
}
}
func extractOverlay(buffer *image.RGBA, postion image.Point) *Overlay {
return &Overlay{
ref: "contextMenu",
active: true,
top: float64(postion.Y),
left: float64(postion.X),
width: float64(buffer.Rect.Max.X),
height: float64(buffer.Rect.Max.Y),
position: postion,
buffer: buffer,
}
}
func (window *Window) SelectEntry(entry *menuEntry) {
window.contextMenu.selectedEntry = entry
window.refreshContextMenu()
window.SetCursor(PointerCursor)
}
func (window *Window) DeselectEntries() {
if window.contextMenu.selectedEntry != nil {
window.contextMenu.selectedEntry = nil
window.refreshContextMenu()
window.SetCursor(DefaultCursor)
}
}
func (entry *menuEntry) PointIntersects(x, y float64) bool {
top, left, width, height := entry.getCoords()
if x > left &&
x < left+width &&
y > top &&
y < top+height {
return true
}
return false
}
func (entry *menuEntry) getCoords() (float64, float64, float64, float64) {
return entry.top, entry.left, entry.width, entry.height
}
func (entry *menuEntry) setCoords(top, left, width, height float64) {
entry.top, entry.left = top, left
entry.width, entry.height = width, height
}