/** DGui project file.

Copyright: Trogu Antonio Davide 2011-2013

License: $(HTTP boost.org/LICENSE_1_0.txt, Boost License 1.0).

Authors: Trogu Antonio Davide
*/
module dgui.tooltip;

import dgui.core.controls.subclassedcontrol;

enum ToolTipIcons
{
	none	= TTI_NONE,
	info 	= TTI_INFO,
	warning = TTI_WARNING,
	error   = TTI_ERROR,
}

class ToolTip: SubclassedControl
{
	private ToolTipIcons _ttIcon = ToolTipIcons.none;
	private bool _creating = false;
	private Control _ctrl;
	private string _title;

	public override void dispose()
	{
		if(this._ctrl)
		{
			this.removeTool();
		}

		super.dispose();
	}

	private void addTool(Control c)
	{
		this._ctrl = c;

		TOOLINFOW ti;

		ti.cbSize = TOOLINFOW.sizeof;
		ti.uFlags = TTF_SUBCLASS | TTF_IDISHWND;
		ti.lpszText = cast(wchar*)LPSTR_TEXTCALLBACKW;
		ti.hwnd = c.parent ? c.parent.handle : c.handle;
		ti.uId = cast(uint)c.handle;

		this.sendMessage(TTM_ADDTOOLW, 0, cast(LPARAM)&ti);
	}

	private void removeTool()
	{
		TOOLINFOW ti;

		ti.cbSize = TOOLINFOW.sizeof;
		ti.hwnd = this._ctrl.parent ? this._ctrl.parent.handle : this._ctrl.handle;
		ti.uId = cast(uint)this._ctrl.handle;

		this.sendMessage(TTM_DELTOOLW, 0, cast(LPARAM)&ti);
		this._ctrl = null;
	}

	@property public void icon(ToolTipIcons tti)
	{
		this._ttIcon = tti;

		if(this.created)
		{
			this.sendMessage(TTM_SETTITLEW, this._ttIcon, cast(LPARAM)toUTFz!(wchar*)(this._title));
		}
	}

	@property public string title()
	{
		return this._title;
	}

	@property public void title(string s)
	{
		this._title = s;

		if(this.created)
		{
			this.sendMessage(TTM_SETTITLEW, this._ttIcon, cast(LPARAM)toUTFz!(wchar*)(this._title));
		}
	}

	@property public void baloonTip(bool b)
	{
		this.setStyle(TTS_BALLOON, b);
	}

	@property public void closeButton(bool b)
	{
		this.setStyle(TTS_CLOSE, b);
	}

	@property public void alwaysTip(bool b)
	{
		this.setStyle(TTS_ALWAYSTIP, b);
	}

	@property public override void parent(Control c)
	{
		if(this._creating)
		{
			super.parent = c;
		}
		else
		{
			throwException!(DGuiException)("A ToolTip cannot have a parent");
		}
	}

	public final void activate(Control c)
	{
		if(!this.created)
		{
			this._creating = true;
			this.parent = c.parent ? c.parent : c;
			this.show();
			this._creating = false;
		}

		if(this._ctrl !is c)
		{
			if(this._ctrl)
			{
				this.removeTool();
			}

			this.addTool(c);
		}

		this.sendMessage(TTM_ACTIVATE, true, 0);
	}

	public override void show()
	{
		if(this._creating)
		{
			super.show();
		}
		else
		{
			throwException!(DGuiException)("Cannot create a ToolTip directly");
		}
	}

	protected override void createControlParams(ref CreateControlParams ccp)
	{
		ccp.superclassName = WC_TOOLTIP;
		ccp.className = WC_DTOOLTIP;
		ccp.defaultBackColor = SystemColors.colorInfo;
		ccp.defaultForeColor = SystemColors.colorInfoText;

		this.setStyle(WS_POPUP | TTS_NOPREFIX, true);
		this.setExStyle(WS_EX_TOPMOST | WS_EX_TOOLWINDOW, true);

		/* According To MSDN:
		    The window procedure for the tooltip control automatically sets the size, position, and visibility of the control.
		    The height of the tooltip window is based on the height of the font currently selected into the device context
		    for the tooltip control.
		    The width varies based on the length of the string currently in the tooltip window. */
		this.bounds = Rect(CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT);

		ToolTip.setBit(this._cBits, ControlBits.cannotAddChild | ControlBits.useCachedText, true);
		super.createControlParams(ccp);
	}

	protected override void onReflectedMessage(ref Message m)
	{
		if(m.msg == WM_NOTIFY)
		{
			NMHDR* pNotify = cast(NMHDR*)m.lParam;

			if(pNotify.code == TTN_GETDISPINFOW)
			{
				NMTTDISPINFOW* pDispInfo = cast(NMTTDISPINFOW*)pNotify;
				pDispInfo.lpszText = toUTFz!(wchar*)(this.text);
			}
		}

		super.onReflectedMessage(m);
	}

	protected override void onHandleCreated(EventArgs e)
	{
		if(this._ttIcon !is ToolTipIcons.none || this._title.length)
		{
			this.sendMessage(TTM_SETTITLEW, this._ttIcon, cast(LPARAM)toUTFz!(wchar*)(this._title));
		}

		SetWindowPos(this._handle, cast(HWND)HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE);
		super.onHandleCreated(e);
	}
}