w32control.go

package gform

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

type W32Control struct {
	ControlBase

	originalWndProc uintptr
	isMouseLeft     bool
}

func (this *W32Control) init(className string, parent Controller, exstyle, style uint) {
	this.hwnd = CreateWindow(className, parent, exstyle, style)
	if this.hwnd == 0 {
		panic("cannot create window for " + className)
	}
	this.isMouseLeft = true
	this.originalWndProc = w32.SetWindowLongPtr(this.hwnd, w32.GWLP_WNDPROC, GeneralWndprocCallBack)
	this.ControlBase.init(parent)
}

func (this *W32Control) attach(parent Controller, dlgItemID int) {
	if parent == nil {
		panic("parent cannot be nil")
	}

	if this.hwnd = w32.GetDlgItem(parent.Handle(), dlgItemID); this.hwnd == 0 {
		panic("hwnd cannot be nil")
	}

	this.isMouseLeft = true
	this.originalWndProc = w32.SetWindowLongPtr(this.hwnd, w32.GWLP_WNDPROC, GeneralWndprocCallBack)
	this.ControlBase.init(parent)
}

func (this *W32Control) WndProc(msg uint, wparam, lparam uintptr) uintptr {
	switch msg {
	case w32.WM_CREATE:
		internalTrackMouseEvent(this.hwnd)
		this.onCreate.Fire(NewEventArg(this, nil))
	case w32.WM_MOUSEMOVE:
		if this.isMouseLeft {
			this.onMouseHover.Fire(NewEventArg(this, nil))
			internalTrackMouseEvent(this.hwnd)
			this.isMouseLeft = false
		}
	case w32.WM_MOUSELEAVE:
		this.onMouseLeave.Fire(NewEventArg(this, nil))
		this.isMouseLeft = true
	}
	return w32.CallWindowProc(this.originalWndProc, this.hwnd, uint32(msg), wparam, lparam)
}