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Window.go
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Window.go
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package giu
import (
"fmt"
"github.com/AllenDang/imgui-go"
)
// SingleWindow creates one window filling all available space
// in MasterWindow. If SingleWindow is set up, no other windows may be
// defined.
func SingleWindow() *WindowWidget {
size := Context.platform.DisplaySize()
title := fmt.Sprintf("SingleWindow_%d", Context.GetWidgetIndex())
return Window(title).
Flags(
imgui.WindowFlagsNoTitleBar|
imgui.WindowFlagsNoCollapse|
imgui.WindowFlagsNoScrollbar|
imgui.WindowFlagsNoMove|
imgui.WindowFlagsNoResize).
Size(size[0], size[1])
}
// SingleWindowWithMenuBar creates a SingleWindow and allows to add menubar on its top.
func SingleWindowWithMenuBar() *WindowWidget {
size := Context.platform.DisplaySize()
title := fmt.Sprintf("SingleWindow_%d", Context.GetWidgetIndex())
return Window(title).
Flags(
imgui.WindowFlagsNoTitleBar|
imgui.WindowFlagsNoCollapse|
imgui.WindowFlagsNoScrollbar|
imgui.WindowFlagsNoMove|
imgui.WindowFlagsMenuBar|
imgui.WindowFlagsNoResize).Size(size[0], size[1])
}
var _ Disposable = &windowState{}
type windowState struct {
hasFocus bool
currentPosition,
currentSize imgui.Vec2
}
// Dispose implements Disposable interface.
func (s *windowState) Dispose() {
// noop
}
// WindowWidget represents imgui.Window
// Windows are used to display ui widgets.
// They are in second place in the giu hierarchy (after the MasterWindow)
// NOTE: to disable multiple window, use SingleWindow.
type WindowWidget struct {
title string
open *bool
flags WindowFlags
x, y float32
width, height float32
bringToFront bool
}
// Window creates a WindowWidget.
func Window(title string) *WindowWidget {
return &WindowWidget{
title: title,
}
}
// IsOpen sets if window widget is `opened` (minimized).
func (w *WindowWidget) IsOpen(open *bool) *WindowWidget {
w.open = open
return w
}
// Flags sets window flags.
func (w *WindowWidget) Flags(flags WindowFlags) *WindowWidget {
w.flags = flags
return w
}
// Size sets window size
// NOTE: size can be changed by user, if you want to prevent
// user from changing window size, use NoResize flag.
func (w *WindowWidget) Size(width, height float32) *WindowWidget {
w.width, w.height = width, height
return w
}
// Pos sets the window start position
// NOTE: The position could be changed by user later.
// To prevent user from changing window position use
// WIndowFlagsNoMove.
func (w *WindowWidget) Pos(x, y float32) *WindowWidget {
w.x, w.y = x, y
return w
}
// Layout is a final step of the window setup.
// it should be called to add a layout to the window and build it.
func (w *WindowWidget) Layout(widgets ...Widget) {
if widgets == nil {
return
}
ws := w.getState()
if w.flags&imgui.WindowFlagsNoMove != 0 && w.flags&imgui.WindowFlagsNoResize != 0 {
imgui.SetNextWindowPos(imgui.Vec2{X: w.x, Y: w.y})
imgui.SetNextWindowSize(imgui.Vec2{X: w.width, Y: w.height})
} else {
imgui.SetNextWindowPosV(imgui.Vec2{X: w.x, Y: w.y}, imgui.ConditionFirstUseEver, imgui.Vec2{X: 0, Y: 0})
imgui.SetNextWindowSizeV(imgui.Vec2{X: w.width, Y: w.height}, imgui.ConditionFirstUseEver)
}
if w.bringToFront {
imgui.SetNextWindowFocus()
w.bringToFront = false
}
widgets = append(widgets,
Custom(func() {
hasFocus := IsWindowFocused(0)
if !hasFocus && ws.hasFocus {
Context.InputHandler.UnregisterWindowShortcuts()
}
ws.hasFocus = hasFocus
ws.currentPosition = imgui.WindowPos()
ws.currentSize = imgui.WindowSize()
}),
)
showed := imgui.BeginV(Context.FontAtlas.RegisterString(w.title), w.open, int(w.flags))
if showed {
Layout(widgets).Build()
}
imgui.End()
}
// CurrentPosition returns a current position of the window.
func (w *WindowWidget) CurrentPosition() (x, y float32) {
pos := w.getState().currentPosition
return pos.X, pos.Y
}
// CurrentSize returns current size of the window.
func (w *WindowWidget) CurrentSize() (width, height float32) {
size := w.getState().currentSize
return size.X, size.Y
}
// BringToFront sets window focused.
func (w *WindowWidget) BringToFront() {
w.bringToFront = true
}
// HasFocus returns true if window is focused.
func (w *WindowWidget) HasFocus() bool {
return w.getState().hasFocus
}
// RegisterKeyboardShortcuts adds local (window-level) keyboard shortcuts
// see InputHandler.go.
func (w *WindowWidget) RegisterKeyboardShortcuts(s ...WindowShortcut) *WindowWidget {
if w.HasFocus() {
for _, shortcut := range s {
Context.InputHandler.RegisterKeyboardShortcuts(Shortcut{
Key: shortcut.Key,
Modifier: shortcut.Modifier,
Callback: shortcut.Callback,
IsGlobal: LocalShortcut,
})
}
}
return w
}
func (w *WindowWidget) getStateID() string {
return fmt.Sprintf("%s_windowState", w.title)
}
// returns window state.
func (w *WindowWidget) getState() (state *windowState) {
if state = GetState[windowState](Context, w.getStateID()); state == nil {
state = &windowState{}
SetState(Context, w.getStateID(), state)
}
return state
}