show_dialog.hpp

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/*
   Copyright (C) 2003 - 2016 by David White <[email protected]>
   Part of the Battle for Wesnoth Project http://www.wesnoth.org/

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY.

   See the COPYING file for more details.
*/

#ifndef SHOW_DIALOG_HPP_INCLUDED
#define SHOW_DIALOG_HPP_INCLUDED

class config;
class display;

#include "cursor.hpp"
#include "floating_label.hpp"
#include "font.hpp"
#include "tooltips.hpp"
#include "video.hpp"
#include "widgets/menu.hpp"

namespace gui
{

extern const int ButtonHPadding;
extern const int ButtonVPadding;
enum DIALOG_RESULT {
    DIALOG_BACK=-7,
    DIALOG_FORWARD=-6,
    CREATE_ITEM =-5,
    DELETE_ITEM=-4,
    ESCAPE_DIALOG=-3, //special return used by WML event dialogs
    CONTINUE_DIALOG=-2,
    CLOSE_DIALOG=-1
    /* results (0..N) reserved for standard button indices */
};

bool in_dialog();

struct dialog_manager : private cursor::setter, private font::floating_label_context {
    dialog_manager();
    ~dialog_manager();

private:
    bool reset_to;
};

class dialog_frame :public video2::draw_layering {
public:
    struct dimension_measurements {
        dimension_measurements();
        SDL_Rect interior, exterior, title, button_row;
    };
    class style {
    public:
        style(std::string const& p, int br) : panel(p), blur_radius(br) {}
        std::string panel;
        int blur_radius;
    };

    //Static members
    static const int title_border_w, title_border_h;
    static const style default_style;
    static const style message_style;
    static const style preview_style;
    static const style titlescreen_style;

    dialog_frame(CVideo &video, const std::string& title="",
        const style& dialog_style=default_style,
        bool auto_restore=true, std::vector<button*>* buttons=nullptr,
        button* help_button=nullptr);
    ~dialog_frame();

    dimension_measurements layout(int x, int y, int w, int h);
    dimension_measurements layout(SDL_Rect const& frame_area);
    void set_layout(dimension_measurements &new_dim) { dim_ = new_dim; }
    dimension_measurements get_layout() const { return dim_; }

    int top_padding() const;
    int bottom_padding() const;

    void draw();

    //called by draw
    void draw_border();
    void draw_background();

    //also called by layout with null param
    SDL_Rect draw_title(CVideo *video);

    void set_dirty(bool dirty = true);

    virtual void handle_event(const SDL_Event&);
    void handle_window_event(const SDL_Event& event);

private:
    void clear_background();

    std::string title_;
    CVideo &video_;
    const style& dialog_style_;
    std::vector<button*>* buttons_;
    button* help_button_;
    surface_restorer* restorer_;
    bool auto_restore_;
    dimension_measurements dim_;
#ifdef SDL_GPU
    sdl::timage top_, bot_, left_, right_, top_left_, bot_left_, top_right_, bot_right_, bg_;
#else
    surface top_, bot_, left_, right_, top_left_, bot_left_, top_right_, bot_right_, bg_;
#endif
    bool have_border_;
    bool dirty_;
};

//frame_measurements draw_dialog_frame(int x, int y, int w, int h, CVideo &video, const std::string* dialog_style=nullptr, surface_restorer* restorer=nullptr);

//SDL_Rect draw_dialog_background(int x, int y, int w, int h, CVideo &video, const std::string& dialog_style);

//given the location of a dialog, will draw its title.
//Returns the area the title takes up
//SDL_Rect draw_dialog_title(int x, int y, CVideo* disp, const std::string& text, label** label_widget);

//function to draw a dialog on the screen. x,y,w,h give the dimensions of the client area
//of the dialog. 'title' is the title of the dialog. The title will be displayed at the
//top of the dialog above the client area. 'dialog_style' if present gives the style of
//the dialog to use.
//'buttons' contains pointers to standard dialog buttons such as 'ok' and 'cancel' that
//will appear on the dialog. If present, they will be located at the bottom of the dialog,
//below the client area.
//if 'restorer' is present, it will be set to a restorer that will reset the screen area
//to its original state after the dialog is drawn.
//void draw_dialog(int x, int y, int w, int h, CVideo &video, const std::string& title,
 //                const std::string* dialog_style=nullptr, std::vector<button*>* buttons=nullptr,
 //                surface_restorer* restorer=nullptr, button* help_button=nullptr, label** label_widget);
//void draw_dialog(frame_measurements &fm, CVideo &video, const std::string& title,
 //                const std::string* dialog_style=nullptr, std::vector<button*>* buttons=nullptr,
 //                surface_restorer* restorer=nullptr, button* help_button=nullptr, label** label_widget);

class dialog_button_action
{
public:
    virtual ~dialog_button_action() {}

    typedef DIALOG_RESULT RESULT;

    virtual RESULT button_pressed(int menu_selection) = 0;
};

struct dialog_button_info
{
    dialog_button_info(dialog_button_action* handler, const std::string& label) : handler(handler), label(label)
    {}

    dialog_button_action* handler;
    std::string label;
};

enum DIALOG_TYPE { MESSAGE, OK_ONLY, YES_NO, OK_CANCEL, CANCEL_ONLY, CLOSE_ONLY, NULL_DIALOG };

struct check_item {
    check_item(const std::string& label, bool checked) : label(label), checked(checked) {}
    std::string label;
    bool checked;
};

//an interface for a 'preview pane'. A preview pane is shown beside a dialog created
//by 'show_dialog' and shows information about the selection.
class preview_pane : public widget {
public:
    preview_pane(CVideo &video) : widget(video, false) {}
    virtual ~preview_pane() { tooltips::clear_tooltips(location()); }

    virtual bool show_above() const { return false; }
    virtual bool left_side() const = 0;
    virtual void set_selection(int index) = 0;
    virtual sdl_handler_vector handler_members() { return widget::handler_members(); }
};

//if a menu is given, then returns -1 if the dialog was canceled, and the
//index of the selection otherwise. If no menu is given, returns the index
//of the button that was pressed
int show_dialog(CVideo& video, surface image,
                const std::string& caption, const std::string& message,
                DIALOG_TYPE type=MESSAGE,
                const std::vector<std::string>* menu_items=nullptr,
                const std::vector<preview_pane*>* preview_panes=nullptr,
                const std::string& text_widget_label="",
                std::string* text_widget_text=nullptr,
                const int text_widget_max_chars = 256,
                std::vector<check_item>* options=nullptr,
                int xloc=-1,
                int yloc=-1,
                const dialog_frame::style* dialog_style=nullptr,
                std::vector<dialog_button_info>* buttons=nullptr,
                const menu::sorter* sorter=nullptr,
                menu::style* menu_style=nullptr
             );

void check_quit(CVideo &video);

}

#endif