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rt-thread/components/rtgui/widgets/scrollbar.c

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/*
* File : scrollbar.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006 - 2009, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2010-08-09 Bernard first version
*/
#include <rtgui/dc.h>
#include <rtgui/rtgui_theme.h>
#include <rtgui/widgets/scrollbar.h>
static void _rtgui_scrollbar_constructor(rtgui_scrollbar_t *bar)
{
struct rtgui_rect rect = {0, 0, RTGUI_DEFAULT_SB_WIDTH, RTGUI_DEFAULT_SB_HEIGHT};
/* set event handler */
rtgui_object_set_event_handler(RTGUI_OBJECT(bar), rtgui_scrollbar_event_handler);
rtgui_scrollbar_set_range(bar, 0, 100);
rtgui_scrollbar_set_page_step(bar, 20);
rtgui_scrollbar_set_line_step(bar, 10);
bar->status = 0;
bar->thumb_position = 0;
bar->thumb_size = 16;
bar->on_scroll = RT_NULL;
bar->orient = RTGUI_HORIZONTAL;
rtgui_widget_set_rect(RTGUI_WIDGET(bar), &rect);
/* set gc */
RTGUI_WIDGET_TEXTALIGN(RTGUI_WIDGET(bar)) = RTGUI_ALIGN_CENTER_HORIZONTAL | RTGUI_ALIGN_CENTER_VERTICAL;
}
rt_inline rt_uint32_t _rtgui_scrollbar_get_length(rtgui_scrollbar_t *bar)
{
struct rtgui_rect rect;
rtgui_widget_get_rect(RTGUI_WIDGET(bar), &rect);
if (bar->orient & RTGUI_VERTICAL)
return rect.y2 - 2 * (rect.x2 - rect.x1);
return rect.x2 - 2 * (rect.y2 - rect.y1);
}
rt_inline rt_uint32_t _rtgui_scrollbar_get_thumb_position(rtgui_scrollbar_t* bar)
{
rt_uint32_t thumb_position;
/* calculate thumb position */
thumb_position = (rtgui_scrollbar_get_value(bar) - bar->min_position) * _rtgui_scrollbar_get_length(bar) /
(bar->max_position - bar->min_position);
return thumb_position;
}
void rtgui_scrollbar_get_thumb_rect(rtgui_scrollbar_t *bar, rtgui_rect_t *rect)
{
struct rtgui_rect scrollbar_rect;
rtgui_widget_get_rect(RTGUI_WIDGET(bar), &scrollbar_rect);
if (bar->orient & RTGUI_VERTICAL)
{
rt_uint32_t btn_width = scrollbar_rect.x2 - scrollbar_rect.x1;
/* vertical scroll bar */
rect->x1 = scrollbar_rect.x1;
rect->x2 = scrollbar_rect.x2;
rect->y1 = scrollbar_rect.y1 + btn_width + _rtgui_scrollbar_get_thumb_position(bar);
rect->y2 = rect->y1 + btn_width;
}
else
{
rt_uint32_t btn_height = scrollbar_rect.y2 - scrollbar_rect.y1;
/* horizontal scroll bar */
rect->x1 = scrollbar_rect.x1 + btn_height + _rtgui_scrollbar_get_thumb_position(bar);
rect->x2 = rect->x1 + btn_height;
rect->y1 = scrollbar_rect.y1;
rect->y2 = scrollbar_rect.y2;
}
}
DEFINE_CLASS_TYPE(scrollbar, "scrollbar",
RTGUI_WIDGET_TYPE,
_rtgui_scrollbar_constructor,
RT_NULL,
sizeof(struct rtgui_scrollbar));
static void _rtgui_scrollbar_on_mouseclick(struct rtgui_widget * widget, struct rtgui_event * event)
{
rtgui_rect_t btn_rect, bar_rect;
rt_uint32_t thumb_size, thumb_position;
struct rtgui_scrollbar* bar = (struct rtgui_scrollbar*)widget;
struct rtgui_event_mouse* mouse = (struct rtgui_event_mouse*)event;
/* get the thumb size and position */
thumb_size = bar->thumb_size * (bar->max_position - bar->min_position) / _rtgui_scrollbar_get_length(bar);
thumb_position = _rtgui_scrollbar_get_thumb_position(bar);
if (bar->orient == RTGUI_VERTICAL)
{
/* get up arrow button rect */
btn_rect.x1 = widget->extent.x1;
btn_rect.x2 = widget->extent.x2;
btn_rect.y1 = widget->extent.y1;
btn_rect.y2 = widget->extent.y1 + (widget->extent.x2 - widget->extent.x1);
if (rtgui_rect_contains_point(&btn_rect, mouse->x, mouse->y) == RT_EOK)
{
if ((mouse->button & (RTGUI_MOUSE_BUTTON_LEFT | RTGUI_MOUSE_BUTTON_DOWN)) ==
(RTGUI_MOUSE_BUTTON_LEFT | RTGUI_MOUSE_BUTTON_DOWN))
{
bar->status |= SBS_UPARROW;
/* line step */
bar->thumb_position -= bar->line_step;
if (bar->thumb_position < bar->min_position) bar->thumb_position = bar->min_position;
}
else if (mouse->button & RTGUI_MOUSE_BUTTON_UP)
{
bar->status = 0;
}
goto __exit;
}
/* get bar rect */
bar_rect.x1 = widget->extent.x1;
bar_rect.x2 = widget->extent.x2;
bar_rect.y1 = widget->extent.y1 + (widget->extent.x2 - widget->extent.x1);
bar_rect.y2 = widget->extent.y2 - (widget->extent.x2 - widget->extent.x1);
if (rtgui_rect_contains_point(&bar_rect, mouse->x, mouse->y) == RT_EOK)
{
if ((mouse->button & (RTGUI_MOUSE_BUTTON_LEFT | RTGUI_MOUSE_BUTTON_DOWN)) ==
(RTGUI_MOUSE_BUTTON_LEFT | RTGUI_MOUSE_BUTTON_DOWN))
{
/* page step */
if (mouse->y < bar_rect.y1 + thumb_position)
{
bar->thumb_position -= bar->page_step;
if (bar->thumb_position < bar->min_position)
bar->thumb_position = bar->min_position;
}
else if (mouse->y > thumb_position + bar->thumb_size)
{
bar->thumb_position += bar->page_step;
if (bar->thumb_position > bar->max_position - thumb_size)
bar->thumb_position = bar->max_position - thumb_size;
}
}
goto __exit;
}
/* get down arrow button rect */
btn_rect.y1 = widget->extent.y2 - (widget->extent.x2 - widget->extent.x1);
btn_rect.y2 = widget->extent.y2;
bar_rect.y1 = widget->extent.y1 + ((widget->extent.y2 - widget->extent.y1)/2);
bar_rect.y2 = widget->extent.y2 - (widget->extent.x2 - widget->extent.x1);
if (rtgui_rect_contains_point(&btn_rect, mouse->x, mouse->y) == RT_EOK)
{
if ((mouse->button & (RTGUI_MOUSE_BUTTON_LEFT | RTGUI_MOUSE_BUTTON_DOWN)) ==
(RTGUI_MOUSE_BUTTON_LEFT | RTGUI_MOUSE_BUTTON_DOWN))
{
bar->status |= SBS_DOWNARROW;
/* line step */
bar->thumb_position += bar->line_step;
if (bar->thumb_position > bar->max_position - thumb_size)
bar->thumb_position = bar->max_position - thumb_size;
}
else if (mouse->button & RTGUI_MOUSE_BUTTON_UP)
bar->status = 0;
}
}
else
{
/* get left arrow button rect */
btn_rect.x1 = widget->extent.x1;
btn_rect.x2 = widget->extent.x1 + (widget->extent.y2 - widget->extent.y1);
btn_rect.y1 = widget->extent.y1;
btn_rect.y2 = widget->extent.y2;
if (rtgui_rect_contains_point(&btn_rect, mouse->x, mouse->y) == RT_EOK)
{
if ((mouse->button & (RTGUI_MOUSE_BUTTON_LEFT | RTGUI_MOUSE_BUTTON_DOWN)) ==
(RTGUI_MOUSE_BUTTON_LEFT | RTGUI_MOUSE_BUTTON_DOWN))
{
bar->status |= SBS_LEFTARROW;
/* line step */
bar->thumb_position -= bar->line_step;
if (bar->thumb_position < bar->min_position) bar->thumb_position = bar->min_position;
}
else if (mouse->button & RTGUI_MOUSE_BUTTON_UP)
bar->status = 0;
goto __exit;
}
/* get bar rect */
bar_rect.x1 = widget->extent.x1 + (widget->extent.y2 - widget->extent.y1);
bar_rect.x2 = widget->extent.x2 - (widget->extent.y2 - widget->extent.y1);
bar_rect.y1 = widget->extent.y1;
bar_rect.y2 = widget->extent.y2;
if (rtgui_rect_contains_point(&bar_rect, mouse->x, mouse->y) == RT_EOK)
{
if ((mouse->button & (RTGUI_MOUSE_BUTTON_LEFT | RTGUI_MOUSE_BUTTON_DOWN)) ==
(RTGUI_MOUSE_BUTTON_LEFT | RTGUI_MOUSE_BUTTON_DOWN))
{
/* page step */
if (mouse->x < bar_rect.x1 + thumb_position)
{
bar->thumb_position -= bar->page_step;
if (bar->thumb_position < bar->min_position)
bar->thumb_position = bar->min_position;
}
else if (mouse->x > thumb_position + bar->thumb_size)
{
bar->thumb_position += bar->page_step;
if (bar->thumb_position > bar->max_position - thumb_size)
bar->thumb_position = bar->max_position - thumb_size;
}
}
goto __exit;
}
/* get right arrow button rect */
btn_rect.x1 = widget->extent.x2 - (widget->extent.y2 - widget->extent.y1);
btn_rect.x2 = widget->extent.x2;
bar_rect.x1 = widget->extent.x1 + ((widget->extent.x2 - widget->extent.x1)/2);
bar_rect.x2 = widget->extent.x2 - (widget->extent.y2 - widget->extent.y1);
if (rtgui_rect_contains_point(&btn_rect,
mouse->x, mouse->y) == RT_EOK)
{
if ((mouse->button & (RTGUI_MOUSE_BUTTON_LEFT | RTGUI_MOUSE_BUTTON_DOWN)) ==
(RTGUI_MOUSE_BUTTON_LEFT | RTGUI_MOUSE_BUTTON_DOWN))
{
bar->status |= SBS_RIGHTARROW;
/* line step */
bar->thumb_position += bar->line_step;
if (bar->thumb_position > bar->max_position - bar->line_step)
bar->thumb_position = bar->max_position - bar->line_step;
}
else if (mouse->button & RTGUI_MOUSE_BUTTON_UP)
bar->status = 0;
}
}
__exit:
rtgui_theme_draw_scrollbar(bar);
if ((mouse->button & (RTGUI_MOUSE_BUTTON_LEFT | RTGUI_MOUSE_BUTTON_DOWN)) ==
(RTGUI_MOUSE_BUTTON_LEFT | RTGUI_MOUSE_BUTTON_DOWN))
{
if (bar->on_scroll != RT_NULL)
bar->on_scroll(RTGUI_OBJECT(widget), RT_NULL);
}
}
rt_bool_t rtgui_scrollbar_event_handler(struct rtgui_object *object,
struct rtgui_event *event)
{
struct rtgui_scrollbar* bar;
RTGUI_WIDGET_EVENT_HANDLER_PREPARE
bar = RTGUI_SCROLLBAR(object);
switch (event->type)
{
case RTGUI_EVENT_PAINT:
#ifndef RTGUI_USING_SMALL_SIZE
if (widget->on_draw != RT_NULL)
widget->on_draw(RTGUI_OBJECT(widget), event);
else
#endif
{
rtgui_theme_draw_scrollbar(bar);
}
break;
case RTGUI_EVENT_MOUSE_BUTTON:
if (RTGUI_WIDGET_IS_ENABLE(widget) && !RTGUI_WIDGET_IS_HIDE(widget))
{
#ifndef RTGUI_USING_SMALL_SIZE
if (widget->on_mouseclick != RT_NULL)
{
widget->on_mouseclick(RTGUI_OBJECT(widget), event);
}
else
#endif
{
_rtgui_scrollbar_on_mouseclick(widget, event);
}
}
break;
default:
return rtgui_widget_event_handler(object, event);
}
return RT_FALSE;
}
struct rtgui_scrollbar* rtgui_scrollbar_create(int orient, rtgui_rect_t* r)
{
struct rtgui_scrollbar* bar;
bar = (struct rtgui_scrollbar*) rtgui_widget_create (RTGUI_SCROLLBAR_TYPE);
if (bar != RT_NULL)
{
if (r != RT_NULL)
{
rtgui_widget_set_rect(RTGUI_WIDGET(bar), r);
if (orient == RTGUI_VERTICAL)
bar->thumb_size = (r->x2 - r->x1);
else
bar->thumb_size = (r->y2 - r->y1);
}
bar->orient = orient;
}
return bar;
}
void rtgui_scrollbar_destroy(struct rtgui_scrollbar* bar)
{
rtgui_widget_destroy(RTGUI_WIDGET(bar));
}
void rtgui_scrollbar_set_orientation(rtgui_scrollbar_t* bar, int orientation)
{
RT_ASSERT(bar != RT_NULL);
bar->orient = orientation;
#ifndef RTGUI_USING_SMALL_SIZE
if (bar->orient == RTGUI_HORIZONTAL)
{
/* horizontal */
rtgui_widget_set_miniwidth(RTGUI_WIDGET(bar), RTGUI_DEFAULT_SB_WIDTH);
rtgui_widget_set_miniheight(RTGUI_WIDGET(bar), RTGUI_DEFAULT_SB_HEIGHT);
}
else
{
/* vertical */
rtgui_widget_set_miniwidth(RTGUI_WIDGET(bar), RTGUI_DEFAULT_SB_HEIGHT);
rtgui_widget_set_miniheight(RTGUI_WIDGET(bar), RTGUI_DEFAULT_SB_WIDTH);
}
#endif
}
void rtgui_scrollbar_set_range(struct rtgui_scrollbar* bar, int min, int max)
{
RT_ASSERT(bar != RT_NULL);
if (min >= max )
{
RTGUI_WIDGET_DISABLE(RTGUI_WIDGET(bar));
return;
}
bar->min_position = (rt_int16_t)min;
bar->max_position = (rt_int16_t)max;
}
void rtgui_scrollbar_set_page_step(struct rtgui_scrollbar* bar, int step)
{
RT_ASSERT(bar != RT_NULL);
bar->page_step = step;
/* disable or enable scrollbar */
if (bar->page_step > (bar->max_position - bar->min_position))
{
/* disable bar */
RTGUI_WIDGET_DISABLE(RTGUI_WIDGET(bar));
}
else
{
/* enable bar */
RTGUI_WIDGET_ENABLE(RTGUI_WIDGET(bar));
}
}
void rtgui_scrollbar_set_line_step(struct rtgui_scrollbar* bar, int step)
{
RT_ASSERT(bar != RT_NULL);
bar->line_step = step;
}
rt_int16_t rtgui_scrollbar_get_value(struct rtgui_scrollbar* bar)
{
RT_ASSERT(bar != RT_NULL);
return bar->thumb_position;
}
void rtgui_scrollbar_set_value(struct rtgui_scrollbar* bar, rt_int16_t position)
{
RT_ASSERT(bar != RT_NULL);
bar->thumb_position = position;
rtgui_widget_update(RTGUI_WIDGET(bar));
}
void rtgui_scrollbar_set_onscroll(struct rtgui_scrollbar* bar,
rtgui_event_handler_ptr handler)
{
if (bar == RT_NULL || handler == RT_NULL) return;
bar->on_scroll = handler;
}
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