133 lines
3.1 KiB
Go
133 lines
3.1 KiB
Go
// 12 december 2015
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package ui
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import (
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"unsafe"
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)
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// #include "ui.h"
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import "C"
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// no need to lock this; only the GUI thread can access it
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var controls = make(map[*C.uiControl]Control)
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// Control represents a GUI control. It provdes methods
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// common to all Controls.
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//
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// The preferred way to create new Controls is to use
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// ControlBase; see ControlBase below.
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type Control interface {
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// Destroy destroys the Control.
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Destroy()
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// Handle returns the OS-level handle that backs the
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// Control. On OSs that use reference counting for
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// controls, Handle does not increment the reference
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// count; you are sharing package ui's reference.
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Handle() uintptr
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// Visible returns whether the Control is visible.
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Visible() bool
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// Show shows the Control.
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Show()
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// Hide shows the Control. Hidden controls do not participate
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// in layout (that is, Box, Grid, etc. does not reserve space for
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// hidden controls).
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Hide()
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// Enabled returns whether the Control is enabled.
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Enabled() bool
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// Enable enables the Control.
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Enable()
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// Disable disables the Control.
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Disable()
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}
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// ControlBase is an implementation of Control that provides
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// all the methods that Control requires. To use it, embed a
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// ControlBase (not a *ControlBase) into your structure, then
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// assign the result of NewControlBase to that field:
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//
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// type MyControl struct {
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// ui.ControlBase
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// c *C.MyControl
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// }
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//
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// func NewMyControl() *MyControl {
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// m := &NewMyControl{
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// c: C.newMyControl(),
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// }
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// m.ControlBase = ui.NewControlBase(m, uintptr(unsafe.Pointer(c)))
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// return m
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// }
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type ControlBase struct {
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iface Control
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c *C.uiControl
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}
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// NewControlBase creates a new ControlBase. See the
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// documentation of ControlBase for an example.
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// NewControl should only be called once per instance of Control.
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func NewControlBase(iface Control, c uintptr) ControlBase {
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b := ControlBase{
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iface: iface,
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c: (*C.uiControl)(unsafe.Pointer(c)),
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}
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controls[b.c] = b.iface
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return b
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}
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func (c *ControlBase) Destroy() {
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delete(controls, c.c)
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C.uiControlDestroy(c.c)
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}
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func (c *ControlBase) Handle() uintptr {
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return uintptr(C.uiControlHandle(c.c))
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}
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func (c *ControlBase) Visible() bool {
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return tobool(C.uiControlVisible(c.c))
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}
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func (c *ControlBase) Show() {
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C.uiControlShow(c.c)
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}
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func (c *ControlBase) Hide() {
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C.uiControlHide(c.c)
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}
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func (c *ControlBase) Enabled() bool {
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return tobool(C.uiControlEnabled(c.c))
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}
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func (c *ControlBase) Enable() {
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C.uiControlEnable(c.c)
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}
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func (c *ControlBase) Disable() {
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C.uiControlDisable(c.c)
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}
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// ControlFromLibui returns the Control associated with a libui
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// uiControl. This is intended for implementing event handlers
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// on the Go side, to prevent sharing Go pointers with C.
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// This function only works on Controls that use ControlBase.
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func ControlFromLibui(c uintptr) Control {
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// comma-ok form to avoid creating nil entries
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c, _ := controls[(*C.uiControl)(unsafe.Pointer(c))]
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return c
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}
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// LibuiFreeText allows implementations of Control
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// to call the libui function uiFreeText.
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func LibuiFreeText(c uintptr) {
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C.uiFreeText((*C.char)(unsafe.Pointer(c)))
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}
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