customcontrol.go

package gform

import (
	"github.com/AllenDang/w32"
)

type CustomControl struct {
	W32Control

	ClassName      string
	ExStyle, Style uint
}

func (this *CustomControl) Init(parent Controller) {
	if len(this.ClassName) == 0 {
		this.ClassName = "gform_customcontrol"
	}

	RegClassOnlyOnce(this.ClassName)

	if this.Style == 0 {
		this.Style = w32.WS_CHILD | w32.WS_VISIBLE
	}
	this.hwnd = CreateWindow(this.ClassName, parent, this.ExStyle, this.Style)
	this.isMouseLeft = true
	this.ControlBase.init(parent)
}

func (this *CustomControl) WndProc(msg uint32, wparam, lparam uintptr) uintptr {
	sender := GetMsgHandler(this.hwnd)
	switch msg {
	case w32.WM_CREATE:
		internalTrackMouseEvent(this.hwnd)
		this.onCreate.Fire(NewEventArg(sender, nil))
	case w32.WM_CLOSE:
		this.onClose.Fire(NewEventArg(sender, nil))
	case w32.WM_MOUSEMOVE:
		if this.isMouseLeft {
			this.onMouseHover.Fire(NewEventArg(sender, nil))
			internalTrackMouseEvent(this.hwnd)
			this.isMouseLeft = false
		}
	case w32.WM_MOUSELEAVE:
		this.onMouseLeave.Fire(NewEventArg(sender, nil))
		this.isMouseLeft = true
	}
	return w32.DefWindowProc(this.hwnd, msg, wparam, lparam)
}