76 lines
1.4 KiB
Go
76 lines
1.4 KiB
Go
package tomo
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import "sync"
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import "image"
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import "errors"
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var backendLock sync.Mutex
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var backend Backend
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// Run initializes a backend, runs the specified callback function, and runs the
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// event loop in that order. This function blocks until Stop is called, or the
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// backend experiences a fatal error.
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func Run (callback func ()) error {
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loadPlugins()
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if backend != nil {
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return errors.New("there is already a backend running")
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}
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back, err := Initialize()
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if err != nil { return err }
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backendLock.Lock()
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backend = back
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backendLock.Unlock()
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callback()
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return backend.Run()
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}
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func assertBackend () {
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if backend == nil { panic("nil backend") }
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}
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// Stop stops the backend, unblocking run. Run may be called again after calling
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// Stop.
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func Stop () {
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assertBackend()
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backend.Stop()
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backendLock.Lock()
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backend = nil
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backendLock.Unlock()
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}
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func Do (callback func ()) {
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backendLock.Lock()
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if backend != nil { backend.Do(callback) }
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backendLock.Unlock()
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}
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func NewWindow (bounds image.Rectangle) (MainWindow, error) {
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assertBackend()
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return backend.NewWindow(bounds)
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}
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func NewBox () Box {
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assertBackend()
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return backend.NewBox()
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}
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func NewTextBox () TextBox {
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assertBackend()
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return backend.NewTextBox()
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}
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func NewCanvasBox () CanvasBox {
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assertBackend()
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return backend.NewCanvasBox()
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}
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func NewContainerBox () ContainerBox {
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assertBackend()
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return backend.NewContainerBox()
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}
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