/**
 * @file LLAccordionCtrlTab.h
 * @brief Collapsible box control implementation
 *
 * $LicenseInfo:firstyear=2004&license=viewerlgpl$
 * 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
 * $/LicenseInfo$
 */

#ifndef LL_ACCORDIONCTRLTAB_H_
#define LL_ACCORDIONCTRLTAB_H_

#include <string>
#include "llrect.h"
#include "lluictrl.h"
#include "lluicolor.h"
#include "llstyle.h"

class LLUICtrlFactory;
class LLUIImage;
class LLButton;
class LLTextBox;
class LLScrollbar;



// LLAccordionCtrlTab is a container for other controls.
// It has a Header, by clicking on which hosted controls are shown or hidden.
// When hosted controls are show - LLAccordionCtrlTab is expanded.
// When hosted controls are hidden - LLAccordionCtrlTab is collapsed.

class LLAccordionCtrlTab : public LLUICtrl
{
// Interface
public:

    struct Params
     : public LLInitParam::Block<Params, LLUICtrl::Params>
    {
        Optional<bool>          display_children, //expanded or collapsed after initialization
                                collapsible;

        Optional<std::string>   title;

        Optional<S32>           header_height,
                                min_width,
                                min_height;

        // Overlay images (arrows on the left)
        Mandatory<LLUIImage*>   header_expand_img,
                                header_expand_img_pressed,
                                header_collapse_img,
                                header_collapse_img_pressed;

        // Background images for the accordion tabs
        Mandatory<LLUIImage*>   header_image,
                                header_image_over,
                                header_image_pressed,
                                header_image_focused;

        Optional<LLUIColor>     header_bg_color,
                                header_text_color,
                                dropdown_bg_color;

        Optional<bool>          header_visible;

        Optional<bool>          fit_panel;

        Optional<bool>          selection_enabled;

        Optional<S32>           padding_left,
                                padding_right,
                                padding_top,
                                padding_bottom;

        Params();
    };

    typedef LLDefaultChildRegistry child_registry_t;

    virtual ~LLAccordionCtrlTab();

    // Registers callback for expand/collapse events.
    boost::signals2::connection setDropDownStateChangedCallback(commit_callback_t cb);

    // Changes expand/collapse state
    virtual void setDisplayChildren(bool display);

    // Returns expand/collapse state
    virtual bool getDisplayChildren() const { return mDisplayChildren; };

    //set LLAccordionCtrlTab panel
    void        setAccordionView(LLView* panel);
    LLView*     getAccordionView() { return mContainerPanel; };

    std::string getTitle() const;

    // Set text and highlight substring in LLAccordionCtrlTabHeader
    void setTitle(const std::string& title, const std::string& hl = LLStringUtil::null);

    // Set text font style in LLAccordionCtrlTabHeader
    void setTitleFontStyle(std::string style);

    // Set text color in LLAccordionCtrlTabHeader
    void setTitleColor(LLUIColor color);

    boost::signals2::connection setFocusReceivedCallback(const focus_signal_t::slot_type& cb);
    boost::signals2::connection setFocusLostCallback(const focus_signal_t::slot_type& cb);

    void setSelected(bool is_selected);

    bool getCollapsible() { return mCollapsible; };

    void setCollapsible(bool collapsible) { mCollapsible = collapsible; };
    void changeOpenClose(bool is_open);

    void canOpenClose(bool can_open_close) { mCanOpenClose = can_open_close; };
    bool canOpenClose() const { return mCanOpenClose; };

    virtual BOOL postBuild();

    S32 notifyParent(const LLSD& info);
    S32 notify(const LLSD& info);
    bool notifyChildren(const LLSD& info);

    virtual void draw();

    void storeOpenCloseState();
    void restoreOpenCloseState();

protected:
    LLAccordionCtrlTab(const LLAccordionCtrlTab::Params&);
    friend class LLUICtrlFactory;

// Overrides
public:

    // Call reshape after changing size
    virtual void reshape(S32 width, S32 height, BOOL called_from_parent = TRUE);

    /**
     * Raises notifyParent event with "child_visibility_change" = new_visibility
     */
    void onVisibilityChange(BOOL new_visibility);
    virtual void onUpdateScrollToChild(const LLUICtrl * cntrl);

    // Changes expand/collapse state and triggers expand/collapse callbacks
    virtual BOOL handleMouseDown(S32 x, S32 y, MASK mask);

    virtual BOOL handleMouseUp(S32 x, S32 y, MASK mask);
    virtual BOOL handleKey(KEY key, MASK mask, BOOL called_from_parent);

    virtual BOOL handleToolTip(S32 x, S32 y, MASK mask);
    virtual BOOL handleScrollWheel( S32 x, S32 y, S32 clicks );


    virtual bool addChild(LLView* child, S32 tab_group = 0 );

    bool isExpanded() const { return mDisplayChildren; }

    S32 getHeaderHeight();

    // Min size functions

    void setHeaderVisible(bool value);

    bool getHeaderVisible() { return mHeaderVisible;}

    S32 mExpandedHeight; // Height of expanded ctrl.
                         // Used to restore height after expand.

    S32 getPaddingLeft() const { return mPaddingLeft;}
    S32 getPaddingRight() const { return mPaddingRight;}
    S32 getPaddingTop() const { return mPaddingTop;}
    S32 getPaddingBottom() const { return mPaddingBottom;}

    void showAndFocusHeader();

    void setFitPanel( bool fit ) { mFitPanel = true; }
    bool getFitParent() const { return mFitPanel; }

    void setIgnoreResizeNotification(bool ignore) { mSkipChangesOnNotifyParent = ignore;}

protected:
    void adjustContainerPanel   (const LLRect& child_rect);
    void adjustContainerPanel   ();
    S32  getChildViewHeight     ();

    void onScrollPosChangeCallback(S32, LLScrollbar*);

    void show_hide_scrollbar    (const LLRect& child_rect);
    void showScrollbar          (const LLRect& child_rect);
    void hideScrollbar          (const LLRect& child_rect);

    void updateLayout           ( const LLRect& child_rect );
    void ctrlSetLeftTopAndSize  (LLView* panel, S32 left, S32 top, S32 width, S32 height);

    void drawChild(const LLRect& root_rect,LLView* child);

    LLView* findContainerView   ();

    void selectOnFocusReceived();
    void deselectOnFocusLost();

private:

    class LLAccordionCtrlTabHeader;
    LLAccordionCtrlTabHeader* mHeader; //Header

    bool mDisplayChildren; //Expanded/collapsed
    bool mCollapsible;
    bool mHeaderVisible;

    bool mCanOpenClose;
    bool mFitPanel;

    S32 mPaddingLeft;
    S32 mPaddingRight;
    S32 mPaddingTop;
    S32 mPaddingBottom;

    bool mStoredOpenCloseState;
    bool mWasStateStored;
    bool mSkipChangesOnNotifyParent;

    bool mSelectionEnabled;

    LLScrollbar*    mScrollbar;
    LLView*         mContainerPanel;

    LLUIColor mDropdownBGColor;
};

#endif