scrollpane.h

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#ifndef __SCROLLPANE_H__
#define __SCROLLPANE_H__
 
#include <stdint.h>
#include "../chitralekha.h"
#include "base.h"
#include "window.h"
 
#define CHITRALEKHA_SCROLL_TYPE_HORIZONTAL 1
#define CHITRALEKHA_SCROLL_TYPE_VERTICAL   2
 
#define SCROLLBAR_SIZE 18
 
typedef struct _scrollbar_ {
    uint8_t type;
    bool update;
    int bar_x;
    int bar_y;
    int bar_w;
    int bar_h;
    int thumb_posx;
    int thumb_posy;
    int thumb_width;
    int thumb_height;
    int thumb_dragx;
    int thumb_dragy;
    int thumb_lasty;
    int thumb_lastx;
    bool thumbHover;
    double scrollAmount;
    double scrollOffset;
    int contentSize;
} ChScrollbar;
 
typedef struct _scrollpane_ {
    ChWidget wid;
    ChScrollbar hScrollBar;
    ChScrollbar vScrollBar;
    bool paintCallback;
    int lastMouseButton;
    ChWidget* scrollableView;
} ChScrollPane;
 
/*
* ChCreateScrollPane -- Create a new scroll pane
* @param win -- Pointer to main Window
* @param x -- X position of the scroll pane
* @param y -- Y position of the scroll pane
* @param width -- Width of the scroll pane
* @param height -- Height of the scroll pane
*/
XE_EXTERN XE_LIB ChScrollPane*
ChCreateScrollPane(ChWindow* win, int x, int y, int width, int height);
 
/*
* ChScrollUpdateVerticalScroll -- updates the vertical scroll bur thumb
* @param sp -- Pointer to scrollpane
* @param viewport -- viewport
* @param contentsz -- content size
*/
XE_EXTERN XE_LIB void
ChScrollUpdateVerticalScroll(ChScrollPane* sp, ChRect* viewport, int contentSz);
 
/*
* ChScrollUpdateHorizontalScroll -- updates the horizontal scroll bar thumb
* @param sp -- Pointer to scrollpane
* @param viewport -- Pointer to viewport geometry
* @param contentSz -- content size
*/
XE_EXTERN XE_LIB void
ChScrollUpdateHorizontalScroll(ChScrollPane* sp, ChRect* viewport, int contentSz);
 
#endif