sdltextbox.h

游戏开发数据结构Data Structures for Game Programmers

// ============================================================================
// Data Structures For Game Programmers
// Ron Penton
// SDLTextBox.h
// This is a basic SDLGUI library that I've set up for use with the game demos
// I've used in the book.
// ============================================================================
#ifndef SDLTEXTBOX_H
#define SDLTEXTBOX_H

#include "SDLHelpers.h"
#include "SDLGUIItem.h"


class SDLTextBox : public SDLGUIItem
{
public:

// -------------------------------------------------------
// Name:        SDLTextBox::SDLTextBox
// Description: This constructs the text box
// Arguments:   - p_x: x coordinate
//              - p_y: y coordinate
//              - p_w, p_h: the width and height.
//              - p_string: a pointer to the string of
//                          the text box
//              - p_size: the max size of the string.
//              - p_tforecol: the foreground color of the 
//                            text
//              - p_tbackcol: the background color of the
//                            text
//              - p_font: the font of the text.
//              - p_func: the function this calls when
//                        enter is pressed.
// -------------------------------------------------------
    SDLTextBox( int p_x, int p_y,
                int p_w, int p_h,
                char* p_string,
                int p_size,
                SDL_Color p_tforecol,
                SDL_Color p_tbackcol,
                TTF_Font* p_font,
                bool p_enabled,
                void (*p_func)(void) );


// ----------------------------------------------------------------
//  Name:           Draw
//  Description:    draws the item on a surface
//  Arguments:      p_dest: the destination surface
//  Return Value:   None
// ----------------------------------------------------------------
    void Draw( SDL_Surface* p_dest );

// ----------------------------------------------------------------
//  Name:           ClickDown
//  Description:    Tells the item that it was clicked on.
//  Arguments:      None
//  Return Value:   None
// ----------------------------------------------------------------
    void ClickDown();

// ----------------------------------------------------------------
//  Name:           ClickUp
//  Description:    Tells the item that it a mouse was released
//                  on this item
//  Arguments:      None
//  Return Value:   None
// ----------------------------------------------------------------
    void ClickUp();

// ----------------------------------------------------------------
//  Name:           IsOver
//  Description:    determines if a set of coordinates is over this
//                  item
//  Arguments:      p_x, p_y: the coordinates
//  Return Value:   true if the coordinates are over this item
// ----------------------------------------------------------------
    bool IsOver( int p_x, int p_y );

// ----------------------------------------------------------------
//  Name:           ResetOnUp
//  Description:    This tells the item to reset itself because
//                  the user unclicked the mouse (only valid
//                  for some items)
//  Arguments:      None
//  Return Value:   None
// ----------------------------------------------------------------
    void ResetOnUp();

// ----------------------------------------------------------------
//  Name:           CanGetFocus
//  Description:    determines if the item can get the focus
//  Arguments:      None
//  Return Value:   true if the item can get the focus
// ----------------------------------------------------------------
    bool CanGetFocus();

// ----------------------------------------------------------------
//  Name:           GetFocus
//  Description:    tells the item to get the focus or not.
//  Arguments:      p_focus: true if the item gets the focus
//  Return Value:   None
// ----------------------------------------------------------------
    void GetFocus( bool p_focus );

// ----------------------------------------------------------------
//  Name:           KeyPress
//  Description:    tells the GUI that a key was pressed when this
//                  item was in focus
//  Arguments:      p_key: the that was pressed
//                  p_mod: the keyboard modifier flag (shift, alt, 
//                         control).
//                  p_char: the UNICODE representation of the key
//  Return Value:   None
// ----------------------------------------------------------------
    void KeyPress( SDLKey p_key, SDLMod p_mod, Uint16 p_char );

protected:
    char* m_string;
    int m_x, m_y, m_w, m_h;
    int m_size;
    SDL_Color m_tforecol, m_tbackcol;
    TTF_Font* m_font;
    bool m_hasFocus;
    bool m_enabled;
    void (*m_func)(void);

    // this is to implement cursor blinking.
    bool m_blink;
    int m_timer;

};




#endif