85 lines
1.7 KiB
Go
85 lines
1.7 KiB
Go
// Copyright 2011 The Walk Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build windows
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package walk
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import (
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"github.com/lxn/win"
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)
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type MouseButton int
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const (
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LeftButton MouseButton = win.MK_LBUTTON
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RightButton MouseButton = win.MK_RBUTTON
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MiddleButton MouseButton = win.MK_MBUTTON
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)
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type mouseEventHandlerInfo struct {
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handler MouseEventHandler
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once bool
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}
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// MouseEventHandler is called for mouse events. x and y are measured in native pixels.
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type MouseEventHandler func(x, y int, button MouseButton)
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type MouseEvent struct {
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handlers []mouseEventHandlerInfo
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}
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func (e *MouseEvent) Attach(handler MouseEventHandler) int {
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handlerInfo := mouseEventHandlerInfo{handler, false}
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for i, h := range e.handlers {
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if h.handler == nil {
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e.handlers[i] = handlerInfo
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return i
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}
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}
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e.handlers = append(e.handlers, handlerInfo)
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return len(e.handlers) - 1
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}
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func (e *MouseEvent) Detach(handle int) {
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e.handlers[handle].handler = nil
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}
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func (e *MouseEvent) Once(handler MouseEventHandler) {
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i := e.Attach(handler)
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e.handlers[i].once = true
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}
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type MouseEventPublisher struct {
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event MouseEvent
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}
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func (p *MouseEventPublisher) Event() *MouseEvent {
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return &p.event
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}
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// Publish publishes mouse event. x and y are measured in native pixels.
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func (p *MouseEventPublisher) Publish(x, y int, button MouseButton) {
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for i, h := range p.event.handlers {
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if h.handler != nil {
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h.handler(x, y, button)
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if h.once {
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p.event.Detach(i)
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}
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}
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}
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}
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func MouseWheelEventDelta(button MouseButton) int {
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return int(int32(button) >> 16)
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}
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func MouseWheelEventKeyState(button MouseButton) int {
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return int(int32(button) & 0xFFFF)
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}
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