////////////////////////////////////////////////////////////////////////////////////////////////////
// NoesisGUI - http://www.noesisengine.com
// Copyright (c) 2013 Noesis Technologies S.L. All Rights Reserved.
////////////////////////////////////////////////////////////////////////////////////////////////////


#ifndef __GUI_INPUTBINDING_H__
#define __GUI_INPUTBINDING_H__


#include <NsCore/Noesis.h>
#include <NsGui/CoreApi.h>
#include <NsGui/Freezable.h>
#include <NsGui/ICommandSource.h>
#include <NsGui/IUITreeNode.h>
#include <NsCore/BaseComponent.h>
#include <NsCore/ReflectionDeclare.h>
#include <NsCore/Ptr.h>


namespace Noesis
{

NS_INTERFACE ICommand;
class UIElement;
class InputGesture;
class DependencyProperty;

NS_WARNING_PUSH
NS_MSVC_WARNING_DISABLE(4251 4275)

////////////////////////////////////////////////////////////////////////////////////////////////////
/// Represents a binding between an InputGesture and a command.
///
/// You can specify that user input invokes a command by creating a InputBinding. When the user
/// performs the specified input, the ICommand that is set to the *Command* property is executed.
///
/// You can specify that the InputBinding invokes a command that is defined on an object by creating
/// a binding on the *Command*, *CommandParameter*, and *CommandTarget* properties. This enables you
/// to define a custom command and associate it with user input.
///
/// http://msdn.microsoft.com/en-us/library/system.windows.input.inputbinding.aspx
////////////////////////////////////////////////////////////////////////////////////////////////////
class NS_GUI_CORE_API InputBinding: public Freezable, public ICommandSource, public IUITreeNode
{
public:
    InputBinding();
    InputBinding(ICommand* command, InputGesture* gesture);
    ~InputBinding();

    /// Gets or sets the ICommand associated with this InputBinding
    //@{
    ICommand* GetCommand() const override;
    void SetCommand(ICommand* command);
    //@}

    /// Gets or sets the command-specific data for a particular command
    //@{
    BaseComponent* GetCommandParameter() const override;
    void SetCommandParameter(BaseComponent* param);
    //@}

    /// Gets or sets the target element of the command
    //@{
    UIElement* GetCommandTarget() const override;
    void SetCommandTarget(UIElement* target);
    //@}

    /// Gets or sets the InputGesture associated with this input binding
    //@{
    InputGesture* GetGesture() const;
    void SetGesture(InputGesture* gesture);
    //@}

    // Hides Freezable methods for convenience
    //@{
    Ptr<InputBinding> Clone() const;
    Ptr<InputBinding> CloneCurrentValue() const;
    //@}

    /// From IUITreeNode
    //@{
    IUITreeNode* GetNodeParent() const final;
    void SetNodeParent(IUITreeNode* parent) final;
    BaseComponent* FindNodeResource(const char* key, bool fullElementSearch) const final;
    ObjectWithNameScope FindNodeName(const char* name) const final;
    //@}

    NS_IMPLEMENT_INTERFACE_FIXUP

public:
    /// Dependency properties
    //@{
    static const DependencyProperty* CommandProperty;
    static const DependencyProperty* CommandParameterProperty;
    static const DependencyProperty* CommandTargetProperty;
    //@}

protected:
    /// Used by inheritors to manage command property changes
    virtual void OnCommandChanged(ICommand* oldCommand, ICommand* newCommand);

    /// Used by inheritors to manage gesture property changes
    virtual void OnGestureChanged(InputGesture* oldGesture, InputGesture* newGesture);

    /// From DependencyObject
    //@{
    bool OnPropertyChanged(const DependencyPropertyChangedEventArgs& args) override;
    //@}

    /// From Freezable
    //@{
    void CloneCommonCore(const Freezable* source) override;
    Ptr<Freezable> CreateInstanceCore() const override;
    //@}


private:
    IUITreeNode* mOwner;
    Ptr<InputGesture> mGesture;

    NS_DECLARE_REFLECTION(InputBinding, Freezable)
};

NS_WARNING_POP

}


#endif