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Making imgui scroll behave properly.

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This commit is contained in:
Dario Manesku 2014-11-22 17:54:13 +01:00
parent 36e02361d1
commit e126781412
1 changed files with 30 additions and 17 deletions
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47
examples/common/imgui/imgui.cpp
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@ -73,6 +73,7 @@ static void imguiFree(void* _ptr, void* /*_userptr*/)
#define IMGUI_MIN(_a, _b) (_a)<(_b)?(_a):(_b)
#define IMGUI_MAX(_a, _b) (_a)>(_b)?(_a):(_b)
#define IMGUI_CLAMP(_a, _min, _max) IMGUI_MIN(IMGUI_MAX(_a, _min), _max)
#define STBTT_malloc(_x, _y) imguiMalloc(_x, _y)
#define STBTT_free(_x, _y) imguiFree(_x, _y)
@ -905,37 +906,35 @@ struct Imgui
const int32_t width = SCROLL_AREA_PADDING * 2;
const int32_t height = area.m_height;
const int32_t aa = area.m_contentY+area.m_height;
const int32_t bb = area.m_widgetY-DEFAULT_SPACING;
const int32_t sbot = IMGUI_MAX(aa, bb);
const int32_t stop = area.m_contentY + (*area.m_scrollVal);
const int32_t sbot = area.m_widgetY - DEFAULT_SPACING;
const int32_t sh = IMGUI_MAX(1, sbot - stop); // The scrollable area height.
const float barHeight = (float)height / (float)sh;
// Handle mouse scrolling.
if (area.m_inside && !anyActive() )
{
const int32_t min = height - sh;
if (min > 0)
{
*area.m_scrollVal = 0;
}
else if (m_scroll)
if (m_scroll)
{
const int32_t diff = height - sh;
const int32_t val = *area.m_scrollVal + 20*m_scroll;
const int32_t min = (diff < 0) ? diff : *area.m_scrollVal;
const int32_t max = 0;
*area.m_scrollVal = ( val > max ? max
: val < min ? min
: val
);
*area.m_scrollVal = IMGUI_CLAMP(val, min, max);
}
}
const uint32_t hid = area.m_scrollId;
const float barHeight = (float)height / (float)sh;
// Draw and handle scroll click.
if (barHeight < 1.0f)
{
float barY = bx::fsaturate( (float)(yy - stop) / (float)sh);
const float barY = bx::fsaturate( (float)(-(*area.m_scrollVal) ) / (float)sh);
// Handle scroll bar logic.
const uint32_t hid = area.m_scrollId;
const int32_t hx = xx;
const int32_t hy = yy + (int)(barY * height);
const int32_t hw = width;
@ -955,8 +954,14 @@ struct Imgui
if (m_dragY != m_my)
{
uu = bx::fsaturate(m_dragOrig + (m_my - m_dragY) / (float)range);
*area.m_scrollVal = (int)(uu * (height - sh) );
const int32_t diff = height - sh;
const int32_t val = *area.m_scrollVal - (m_my - m_dragY);
const int32_t min = (diff < 0) ? diff : *area.m_scrollVal;
const int32_t max = 0;
*area.m_scrollVal = IMGUI_CLAMP(val, min, max);
m_dragY = m_my;
}
}
@ -1027,6 +1032,14 @@ struct Imgui
}
}
}
else
{
// Clear active if scroll is selected but not visible any more.
if (isActive(hid))
{
clearActive();
}
}
area.m_inside = false;