controlbase.go

package gform

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

type ControlBase struct {
	hwnd          w32.HWND
	font          *Font
	parent        Controller
	evtHandlerMap map[uint]EventHandler

	isForm bool

	// General events
	onCreate EventManager
	onClose  EventManager

	// Focus events
	onKillFocus EventManager
	onSetFocus  EventManager

	// Drag and drop events
	onDropFiles EventManager

	// Mouse events
	onLBDown EventManager
	onLBUp   EventManager
	onMBDown EventManager
	onMBUp   EventManager
	onRBDown EventManager
	onRBUp   EventManager

	onMouseHover EventManager
	onMouseLeave EventManager

	// Keyboard events
	onKeyUp EventManager

	// Paint events
	onPaint EventManager
	onSize  EventManager
}

func (this *ControlBase) init(parent Controller) {
	if this.hwnd == 0 {
		panic("hwnd cannot be nil")
	}

	if parent != nil {
		this.parent = parent
	}
}

func (this *ControlBase) Handle() w32.HWND {
	return this.hwnd
}

func (this *ControlBase) SetCaption(caption string) {
	w32.SetWindowText(this.hwnd, caption)
}

func (this *ControlBase) Caption() string {
	return w32.GetWindowText(this.hwnd)
}

func (this *ControlBase) Close() {
	UnRegMsgHandler(this.hwnd)
	w32.DestroyWindow(this.hwnd)
}

func (this *ControlBase) SetSize(width, height int) {
	x, y := this.Pos()
	w32.MoveWindow(this.hwnd, x, y, width, height, true)
}

func (this *ControlBase) Size() (width, height int) {
	rect := w32.GetWindowRect(this.hwnd)
	width = int(rect.Right - rect.Left)
	height = int(rect.Bottom - rect.Top)
	return
}

func (this *ControlBase) Width() int {
	rect := w32.GetWindowRect(this.hwnd)
	return int(rect.Right - rect.Left)
}

func (this *ControlBase) Height() int {
	rect := w32.GetWindowRect(this.hwnd)
	return int(rect.Bottom - rect.Top)
}

func (this *ControlBase) SetPos(x, y int) {
	w, h := this.Size()
	if w == 0 {
		w = 100
	}
	if h == 0 {
		h = 25
	}
	w32.MoveWindow(this.hwnd, x, y, w, h, true)
}

func (this *ControlBase) Pos() (x, y int) {
	rect := w32.GetWindowRect(this.hwnd)
	x = int(rect.Left)
	y = int(rect.Top)
	if !this.isForm && this.parent != nil {
		x, y, _ = w32.ScreenToClient(this.parent.Handle(), x, y)
	}
	return
}

func (this *ControlBase) Visible() bool {
	return w32.IsWindowVisible(this.hwnd)
}

func (this *ControlBase) Bounds() *Rect {
	rect := w32.GetWindowRect(this.hwnd)
	if this.isForm {
		return &Rect{*rect}
	}

	return ScreenToClientRect(this.hwnd, rect)
}

func (this *ControlBase) ClientRect() *Rect {
	rect := w32.GetClientRect(this.hwnd)
	return ScreenToClientRect(this.hwnd, rect)
}

func (this *ControlBase) Show() {
	w32.ShowWindow(this.hwnd, w32.SW_SHOWDEFAULT)
}

func (this *ControlBase) Hide() {
	w32.ShowWindow(this.hwnd, w32.SW_HIDE)
}

func (this *ControlBase) Enabled() bool {
	return w32.IsWindowEnabled(this.hwnd)
}

func (this *ControlBase) SetEnabled(b bool) {
	w32.EnableWindow(this.hwnd, b)
}

func (this *ControlBase) Focus() {
	w32.SetFocus(this.hwnd)
}

func (this *ControlBase) Invalidate(erase bool) {
	pRect := w32.GetClientRect(this.hwnd)
	if this.isForm {
		w32.InvalidateRect(this.hwnd, pRect, erase)
	} else {
		rc := ScreenToClientRect(this.hwnd, pRect)
		w32.InvalidateRect(this.hwnd, rc.GetW32Rect(), erase)
	}
}

func (this *ControlBase) Parent() Controller {
	return this.parent
}

func (this *ControlBase) Font() *Font {
	return this.font
}

func (this *ControlBase) SetFont(font *Font) {
	w32.SendMessage(this.hwnd, w32.WM_SETFONT, uintptr(font.hfont), 1)
	this.font = font
}

func (this *ControlBase) EnableDragAcceptFiles(b bool) {
	w32.DragAcceptFiles(this.hwnd, b)
}

func (this *ControlBase) InvokeRequired() bool {
	if this.hwnd == 0 {
		return false
	}

	windowThreadId, _ := w32.GetWindowThreadProcessId(this.hwnd)
	currentThreadId := w32.GetCurrentThread()

	return windowThreadId != currentThreadId
}

func (this *ControlBase) PreTranslateMessage(msg *w32.MSG) bool {
	return false
}

func (this *ControlBase) Bind(msg uint, handler EventHandler) {
	//Check whether map is already created
	if this.evtHandlerMap == nil {
		this.evtHandlerMap = make(map[uint]EventHandler)
	}

	if handler == nil {
		delete(this.evtHandlerMap, msg)
	} else {
		this.evtHandlerMap[msg] = handler
	}
}

// Get binded handlers for specifed message.
func (this *ControlBase) BindedHandler(msg uint) (EventHandler, bool) {
	handler, ok := this.evtHandlerMap[msg]
	return handler, ok
}

//Events
func (this *ControlBase) OnCreate() *EventManager {
	return &this.onCreate
}

func (this *ControlBase) OnClose() *EventManager {
	return &this.onClose
}

func (this *ControlBase) OnKillFocus() *EventManager {
	return &this.onKillFocus
}

func (this *ControlBase) OnSetFocus() *EventManager {
	return &this.onSetFocus
}

func (this *ControlBase) OnDropFiles() *EventManager {
	return &this.onDropFiles
}

func (this *ControlBase) OnLBDown() *EventManager {
	return &this.onLBDown
}

func (this *ControlBase) OnLBUp() *EventManager {
	return &this.onLBUp
}

func (this *ControlBase) OnMBDown() *EventManager {
	return &this.onMBDown
}

func (this *ControlBase) OnMBUp() *EventManager {
	return &this.onMBUp
}

func (this *ControlBase) OnRBDown() *EventManager {
	return &this.onRBDown
}

func (this *ControlBase) OnRBUp() *EventManager {
	return &this.onRBUp
}

func (this *ControlBase) OnMouseHover() *EventManager {
	return &this.onMouseHover
}

func (this *ControlBase) OnMouseLeave() *EventManager {
	return &this.onMouseLeave
}

func (this *ControlBase) OnPaint() *EventManager {
	return &this.onPaint
}

func (this *ControlBase) OnSize() *EventManager {
	return &this.onSize
}

func (this *ControlBase) OnKeyUp() *EventManager {
	return &this.onKeyUp
}