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/**
* @file llviewmodel.h
* @author Nat Goodspeed
* @date 2008-08-08
* @brief Define "View Model" classes intended to store data values for use
* by LLUICtrl subclasses. The phrase is borrowed from Microsoft
* terminology, in which "View Model" means the storage object
* underlying a specific widget object -- as in our case -- rather
* than the business "model" object underlying the overall "view"
* presented by the collection of widgets.
*
* $LicenseInfo:firstyear=2008&license=viewerlgpl$
* 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
* $/LicenseInfo$
*/
#if ! defined(LL_LLVIEWMODEL_H)
#define LL_LLVIEWMODEL_H
#include "llpointer.h"
#include "llsd.h"
#include "llrefcount.h"
#include "stdenums.h"
#include "llstring.h"
#include "lltrace.h"
#include <string>
class LLScrollListItem;
class LLViewModel;
class LLTextViewModel;
class LLListViewModel;
// Because LLViewModel is derived from LLRefCount, always pass, store
// and return LLViewModelPtr rather than plain LLViewModel*.
typedef LLPointer<LLViewModel> LLViewModelPtr;
typedef LLPointer<LLTextViewModel> LLTextViewModelPtr;
typedef LLPointer<LLListViewModel> LLListViewModelPtr;
/**
* LLViewModel stores a scalar LLSD data item, the current display value of a
* scalar LLUICtrl widget. LLViewModel subclasses are used to store data
* collections used for aggregate widgets. LLViewModel is ref-counted because
* -- for multiple skins -- we may have distinct widgets sharing the same
* LLViewModel data. This way, the LLViewModel is quietly deleted when the
* last referencing widget is destroyed.
*/
class LLViewModel
: public LLRefCount,
public LLTrace::MemTrackable<LLViewModel>
{
public:
LLViewModel();
/// Instantiate an LLViewModel with an existing data value
LLViewModel(const LLSD& value);
/// Update the stored value
virtual void setValue(const LLSD& value);
/// Get the stored value, in appropriate type.
virtual LLSD getValue() const;
/// Has the value been changed since last time we checked?
bool isDirty() const { return mDirty; }
/// Once the value has been saved to a file, or otherwise consumed by the
/// app, we no longer need to enable the Save button
void resetDirty() { mDirty = false; }
//
void setDirty() { mDirty = true; }
static LLTrace::MemStat sMemStat;
protected:
LLSD mValue;
bool mDirty;
};
/**
* LLTextViewModel stores a value displayed as text.
*/
class LLTextViewModel: public LLViewModel
{
public:
LLTextViewModel();
/// Instantiate an LLViewModel with an existing data value
LLTextViewModel(const LLSD& value);
// LLViewModel functions
virtual void setValue(const LLSD& value);
virtual LLSD getValue() const;
// New functions
/// Get the stored value in string form
const LLWString& getDisplay() const { return mDisplay; }
LLWString& getEditableDisplay() { mDirty = true; mUpdateFromDisplay = true; return mDisplay; }
/**
* Set the display string directly (see LLTextEditor). What the user is
* editing is actually the LLWString value rather than the underlying
* UTF-8 value.
*/
void setDisplay(const LLWString& value);
private:
/// To avoid converting every widget's stored value from LLSD to LLWString
/// every frame, cache the converted value
LLWString mDisplay;
/// As the user edits individual characters (setDisplay()), defer
/// LLWString-to-UTF8 conversions until s/he's done.
bool mUpdateFromDisplay;
};
/**
* LLListViewModel stores a list of data items. The semantics are borrowed
* from LLScrollListCtrl.
*/
class LLListViewModel: public LLViewModel
{
public:
LLListViewModel() {}
LLListViewModel(const LLSD& values);
virtual void addColumn(const LLSD& column, EAddPosition pos = ADD_BOTTOM);
virtual void clearColumns();
virtual void setColumnLabel(const std::string& column, const std::string& label);
virtual LLScrollListItem* addElement(const LLSD& value, EAddPosition pos = ADD_BOTTOM,
void* userdata = NULL);
virtual LLScrollListItem* addSimpleElement(const std::string& value, EAddPosition pos,
const LLSD& id);
virtual void clearRows();
virtual void sortByColumn(const std::string& name, bool ascending);
};
//namespace LLViewModel
//{
// class Value
// {
// public:
// Value(const LLSD& value = LLSD());
//
// LLSD getValue() const { return mValue; }
// void setValue(const LLSD& value) { mValue = value; }
//
// bool isAvailable() const { return false; }
// bool isReadOnly() const { return false; }
//
// bool undo() { return false; }
// bool redo() { return false; }
//
// /// Has the value been changed since last time we checked?
// bool isDirty() const { return mDirty; }
// /// Once the value has been saved to a file, or otherwise consumed by the
// /// app, we no longer need to enable the Save button
// void resetDirty() { mDirty = false; }
// //
// void setDirty() { mDirty = true; }
//
// protected:
// LLSD mValue;
// bool mDirty;
// };
//
// class Numeric : public Value
// {
// public:
// Numeric(S32 value = 0);
// Numeric(F32 value);
//
// F32 getPrecision();
// F32 getMin();
// F32 getMax();
//
// void increment();
// void decrement();
// };
//
// class MultipleValues : public Value
// {
// class Selector
// {};
//
// MultipleValues();
// virtual S32 numElements();
// };
//
// class Tuple : public MultipleValues
// {
// Tuple(S32 size);
// LLSD getValue(S32 which) const;
// void setValue(S32 which, const LLSD& value);
// };
//
// class List : public MultipleValues
// {
// List();
//
// void add(const ValueModel& value);
// bool remove(const Selector& item);
//
// void setSortElement(const Selector& element);
// void sort();
// };
//
//};
#endif /* ! defined(LL_LLVIEWMODEL_H) */
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