86 lines
1.9 KiB
Go
86 lines
1.9 KiB
Go
// The UI manager. This manages the components that make up the UI and dispatches
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// events.
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package ui
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// The UI manager
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type Ui struct {
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// The root component
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rootComponent UiComponent
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focusedComponent FocusableComponent
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drawContext *DrawContext
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driver Driver
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}
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// Creates a new UI context. This also initializes the UI state.
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// Returns the context and an error.
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func NewUI() (*Ui, error) {
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driver := &TermboxDriver{}
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err := driver.Init()
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if err != nil {
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return nil, err
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}
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drawContext := &DrawContext{ driver: driver }
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ui := &Ui{ drawContext: drawContext, driver: driver }
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return ui, nil
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}
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// Closes the UI context.
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func (ui *Ui) Close() {
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ui.driver.Close()
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}
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// Sets the root component
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func (ui *Ui) SetRootComponent(comp UiComponent) {
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ui.rootComponent = comp
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ui.Remeasure()
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}
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// Sets the focused component
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func (ui *Ui) SetFocusedComponent(newFocused FocusableComponent) {
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ui.focusedComponent = newFocused
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}
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// Remeasures the UI
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func (ui *Ui) Remeasure() {
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ui.drawContext.X = 0
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ui.drawContext.Y = 0
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ui.drawContext.W, ui.drawContext.H = ui.driver.Size()
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ui.rootComponent.Remeasure(ui.drawContext.W, ui.drawContext.H)
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}
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// Redraws the UI.
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func (ui *Ui) Redraw() {
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ui.Remeasure()
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ui.rootComponent.Redraw(ui.drawContext)
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ui.driver.Sync()
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}
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// Enter the UI loop
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func (ui *Ui) Loop() {
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for {
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ui.Redraw()
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event := ui.driver.WaitForEvent()
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// TODO: If the event is a key-press, do something.
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if event.Type == EventKeyPress {
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if ui.focusedComponent != nil {
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ui.focusedComponent.KeyPressed(event.Ch, event.Par)
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}
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} else if event.Type == EventResize {
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// HACK: Find another way to refresh the size of the screen to prevent a full redraw.
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ui.driver.Sync()
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}
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}
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} |