summaryrefslogtreecommitdiff
path: root/indra/llui/llfocusmgr.h
blob: 3276135fafd89d942c43edf85747ae7c3d47f66e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
/** 
 * @file llfocusmgr.h
 * @brief LLFocusMgr base class
 *
 * $LicenseInfo:firstyear=2002&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

// Singleton that manages keyboard and mouse focus

#ifndef LL_LLFOCUSMGR_H
#define LL_LLFOCUSMGR_H

#include "llstring.h"
#include "llframetimer.h"
#include "llui.h"

class LLUICtrl;
class LLMouseHandler;
class LLView;

// NOTE: the LLFocusableElement class declaration has been moved here from lluictrl.h.
class LLFocusableElement
{
	friend class LLFocusMgr; // allow access to focus change handlers
public:
	LLFocusableElement();
	virtual ~LLFocusableElement();

	virtual void	setFocus( bool b );
	virtual bool	hasFocus() const;

	typedef boost::signals2::signal<void(LLFocusableElement*)> focus_signal_t;
	
	boost::signals2::connection setFocusLostCallback( const focus_signal_t::slot_type& cb);
	boost::signals2::connection	setFocusReceivedCallback(const focus_signal_t::slot_type& cb);
	boost::signals2::connection	setFocusChangedCallback(const focus_signal_t::slot_type& cb);
	boost::signals2::connection	setTopLostCallback(const focus_signal_t::slot_type& cb);

	// These were brought up the hierarchy from LLView so that we don't have to use dynamic_cast when dealing with keyboard focus.
	virtual bool	handleKey(KEY key, MASK mask, bool called_from_parent);
	virtual bool	handleKeyUp(KEY key, MASK mask, bool called_from_parent);
	virtual bool	handleUnicodeChar(llwchar uni_char, bool called_from_parent);

    /**
     * If true this LLFocusableElement wants to receive KEYUP and KEYDOWN messages 
     * even for normal character strokes.  
     * Default implementation returns false.
     */
    virtual bool    wantsKeyUpKeyDown() const;
    virtual bool    wantsReturnKey() const;

	virtual void	onTopLost();	// called when registered as top ctrl and user clicks elsewhere
protected:	
	virtual void	onFocusReceived();
	virtual void	onFocusLost();
	focus_signal_t*  mFocusLostCallback;
	focus_signal_t*  mFocusReceivedCallback;
	focus_signal_t*  mFocusChangedCallback;
	focus_signal_t*  mTopLostCallback;
};


class LLFocusMgr
{
public:
	LLFocusMgr();
	~LLFocusMgr();

	// Mouse Captor
	void			setMouseCapture(LLMouseHandler* new_captor);	// new_captor = NULL to release the mouse.
	LLMouseHandler* getMouseCapture() const { return mMouseCaptor; } 
	void			removeMouseCaptureWithoutCallback( const LLMouseHandler* captor );
	bool			childHasMouseCapture( const LLView* parent ) const;

	// Keyboard Focus
	void			setKeyboardFocus(LLFocusableElement* new_focus, bool lock = false, bool keystrokes_only = false);		// new_focus = NULL to release the focus.
	LLFocusableElement*		getKeyboardFocus() const { return mKeyboardFocus; }  
	LLFocusableElement*		getLastKeyboardFocus() const { return mLastKeyboardFocus; }  
	bool			childHasKeyboardFocus( const LLView* parent ) const;
	void			removeKeyboardFocusWithoutCallback( const LLFocusableElement* focus );
	bool			getKeystrokesOnly() { return mKeystrokesOnly; }
	void			setKeystrokesOnly(bool keystrokes_only) { mKeystrokesOnly = keystrokes_only; }

	F32				getFocusFlashAmt() const;
	S32				getFocusFlashWidth() const { return ll_round(lerp(1.f, 3.f, getFocusFlashAmt())); }
	LLColor4		getFocusColor() const;
	void			triggerFocusFlash();
	bool			getAppHasFocus() const { return mAppHasFocus; }
	void			setAppHasFocus(bool focus);
	LLView*		getLastFocusForGroup(LLView* subtree_root) const;
	void			clearLastFocusForGroup(LLView* subtree_root);

	// If setKeyboardFocus(NULL) is called, and there is a non-NULL default
	// keyboard focus view, focus goes there. JC
	void			setDefaultKeyboardFocus(LLFocusableElement* default_focus) { mDefaultKeyboardFocus = default_focus; }
	LLFocusableElement*		getDefaultKeyboardFocus() const { return mDefaultKeyboardFocus; }

	
	// Top View
	void			setTopCtrl(LLUICtrl* new_top);
	LLUICtrl*		getTopCtrl() const					{ return mTopCtrl; }
	void			removeTopCtrlWithoutCallback( const LLUICtrl* top_view );
	bool			childIsTopCtrl( const LLView* parent ) const;

	// All Three
	void			releaseFocusIfNeeded( LLView* top_view );
	void			lockFocus();
	void			unlockFocus();
	bool			focusLocked() const { return mLockedView != NULL; }

	bool			keyboardFocusHasAccelerators() const;

	struct Impl;

private:
	LLUICtrl*			mLockedView;

	// Mouse Captor
	LLMouseHandler*		mMouseCaptor;				// Mouse events are premptively routed to this object

	// Keyboard Focus
	LLFocusableElement*	mKeyboardFocus;				// Keyboard events are preemptively routed to this object
	LLFocusableElement*	mLastKeyboardFocus;			// who last had focus
	LLFocusableElement*	mDefaultKeyboardFocus;
	bool				mKeystrokesOnly;
	
	// Top View
	LLUICtrl*			mTopCtrl;

	LLFrameTimer		mFocusFlashTimer;

	bool				mAppHasFocus;

	Impl * mImpl;
};

extern LLFocusMgr gFocusMgr;

#endif  // LL_LLFOCUSMGR_H