/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/

#ifndef SFX_SIDEBAR_FOCUS_MANAGER_HXX
#define SFX_SIDEBAR_FOCUS_MANAGER_HXX

#include "Panel.hxx"
#include <tools/link.hxx>

class Button;
class KeyCode;
class VclSimpleEvent;


namespace sfx2 { namespace sidebar {

class DeckTitleBar;

/** Concentrate all focus handling in this class.

    There is one ring of windows that accept the input focus which are
    cycled through with the arrow keys:
    - the closer in the deck title (present only when docked)
    - the panel title bars
    - the tab bar items

    When the focus is in a panel title then focus travels over
    - the panel title
    - the panel closer
    - the panel content

    Once the focus is in the panel content then focus cycles through
    all controls inside the panel but not back to the title bar of
    the panel.  Escape places the focus back in the panel title.
*/
class FocusManager
{
public:
    FocusManager (const ::boost::function<void(const Panel&)>& rShowPanelFunctor);
    ~FocusManager (void);

    /** Forget all panels and buttons.  Remove all window listeners.
    */
    void Clear (void);

    /** Transfer the focus into the sidebar tree of windows.  This is
        typically called from the SidebarChildWindow as result of
        pressing the F6 key.
    */
    void GrabFocus (void);

    void SetDeckTitle (DeckTitleBar* pDeckTitleBar);
    void SetPanels (const SharedPanelContainer& rPanels);
    void SetButtons (const ::std::vector<Button*>& rButtons);

private:
    DeckTitleBar* mpDeckTitleBar;
    ::std::vector<Panel*> maPanels;
    ::std::vector<Button*> maButtons;
    const ::boost::function<void(const Panel&)> maShowPanelFunctor;
    
    enum PanelComponent
    {
        PC_DeckTitle,
        PC_DeckToolBox,
        PC_PanelTitle,
        PC_PanelToolBox,
        PC_PanelContent,
        PC_TabBar,
        PC_None
    };
    class FocusLocation
    {
    public:
        PanelComponent meComponent;
        sal_Int32 mnIndex;
        FocusLocation (const PanelComponent eComponent, const sal_Int32 nIndex);
    };

    /** Listen for key events for panels and buttons.
    */
    DECL_LINK(WindowEventListener, VclSimpleEvent*);
    DECL_LINK(ChildEventListener, VclSimpleEvent*);

    void ClearPanels (void);
    void ClearButtons (void);
    
    /** Let the focus manager listen for window events for the given
        window.
    */
    void RegisterWindow (Window& rWindow);
    void UnregisterWindow (Window& rWindow);

    /** Remove the window from the panel or the button container.
    */
    void RemoveWindow (Window& rWindow);
    
    bool IsAnyPanelFocused (void) const;
    bool IsAnyButtonFocused (void) const;

    void FocusDeckTitle (void);
    bool IsDeckTitleVisible (void) const;

    /** Set the focus to the title bar of the panel or, if the the
        title bar is not visible, directly to the panel.
    */
    void FocusPanel (const sal_Int32 nPanelIndex);
    void FocusPanelContent (const sal_Int32 nPanelIndex);
    void FocusButton (const sal_Int32 nButtonIndex);
    void ClickButton (const sal_Int32 nButtonIndex);
    bool MoveFocusInsidePanel (
        const FocusLocation aLocation,
        const sal_Int32 nDirection);

    void HandleKeyEvent (
        const KeyCode& rKeyCode,
        const Window& rWindow);

    FocusLocation GetFocusLocation (const Window& rWindow) const;

};

} } // end of namespace sfx2::sidebar

#endif