/
ScrollPanel.cpp
195 lines (170 loc) · 4.34 KB
/
ScrollPanel.cpp
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#include <iostream>
#include "ScrollPanel.h"
#include "common/tpt-minmax.h"
using namespace ui;
ScrollPanel::ScrollPanel(Point position, Point size):
Panel(position, size),
scrollBarWidth(0),
maxOffset(0, 0),
offsetX(0),
offsetY(0),
yScrollVel(0.0f),
xScrollVel(0.0f),
isMouseInsideScrollbar(false),
isMouseInsideScrollbarArea(false),
scrollbarSelected(false),
scrollbarInitialYOffset(0),
scrollbarInitialYClick(0),
scrollbarClickLocation(0)
{
}
int ScrollPanel::GetScrollLimit()
{
if (ViewportPosition.Y == 0)
return -1;
else if (maxOffset.Y == -ViewportPosition.Y)
return 1;
return 0;
}
void ScrollPanel::SetScrollPosition(int position)
{
offsetY = position;
ViewportPosition.Y = -position;
}
void ScrollPanel::XOnMouseWheelInside(int localx, int localy, int d)
{
if (!d)
return;
yScrollVel -= d*2;
}
void ScrollPanel::Draw(const Point& screenPos)
{
Panel::Draw(screenPos);
Graphics * g = ui::Engine::Ref().g;
//Vertical scroll bar
if (maxOffset.Y>0 && InnerSize.Y>0)
{
float scrollHeight = float(Size.Y)*(float(Size.Y)/float(InnerSize.Y));
float scrollPos = 0;
if (-ViewportPosition.Y>0)
{
scrollPos = float(Size.Y-scrollHeight)*(float(offsetY)/float(maxOffset.Y));
}
g->fillrect(screenPos.X+(Size.X-scrollBarWidth), screenPos.Y, scrollBarWidth, Size.Y, 125, 125, 125, 100);
g->fillrect(screenPos.X+(Size.X-scrollBarWidth), screenPos.Y+scrollPos, scrollBarWidth, scrollHeight+1, 255, 255, 255, 255);
}
}
void ScrollPanel::XOnMouseClick(int x, int y, unsigned int button)
{
if (isMouseInsideScrollbar)
{
scrollbarSelected = true;
scrollbarInitialYOffset = offsetY;
}
scrollbarInitialYClick = y;
scrollbarClickLocation = 100;
}
void ScrollPanel::XOnMouseUp(int x, int y, unsigned int button)
{
scrollbarSelected = false;
isMouseInsideScrollbarArea = false;
scrollbarClickLocation = 0;
}
void ScrollPanel::XOnMouseMoved(int x, int y, int dx, int dy)
{
if(maxOffset.Y>0 && InnerSize.Y>0)
{
float scrollHeight = float(Size.Y)*(float(Size.Y)/float(InnerSize.Y));
float scrollPos = 0;
if (-ViewportPosition.Y>0)
{
scrollPos = float(Size.Y-scrollHeight)*(float(offsetY)/float(maxOffset.Y));
}
if (scrollbarSelected)
{
if (x > 0)
{
int scrollY = float(y-scrollbarInitialYClick)/float(Size.Y)*float(InnerSize.Y)+scrollbarInitialYOffset;
ViewportPosition.Y = -scrollY;
offsetY = scrollY;
}
else
{
ViewportPosition.Y = -scrollbarInitialYOffset;
offsetY = scrollbarInitialYOffset;
}
}
if (x > (Size.X-scrollBarWidth) && x < (Size.X-scrollBarWidth)+scrollBarWidth)
{
if (y > scrollPos && y < scrollPos+scrollHeight)
isMouseInsideScrollbar = true;
isMouseInsideScrollbarArea = true;
}
else
isMouseInsideScrollbar = false;
}
}
void ScrollPanel::XTick(float dt)
{
if (yScrollVel > -0.5f && yScrollVel < 0.5)
yScrollVel = 0;
if (xScrollVel > 7.0f) xScrollVel = 7.0f;
if (xScrollVel < -7.0f) xScrollVel = -7.0f;
if (xScrollVel > -0.5f && xScrollVel < 0.5)
xScrollVel = 0;
maxOffset = InnerSize-Size;
maxOffset.Y = std::max(0, maxOffset.Y);
maxOffset.X = std::max(0, maxOffset.X);
int oldOffsetY = offsetY;
offsetY += yScrollVel;
offsetX += xScrollVel;
yScrollVel*=0.98f;
xScrollVel*=0.98f;
if (oldOffsetY!=int(offsetY))
{
if (offsetY<0)
{
offsetY = 0;
yScrollVel = 0;
}
else if (offsetY>maxOffset.Y)
{
offsetY = maxOffset.Y;
yScrollVel = 0;
}
ViewportPosition.Y = -offsetY;
}
else
{
if (offsetY<0)
{
offsetY = 0;
yScrollVel = 0;
ViewportPosition.Y = -offsetY;
}
else if (offsetY>maxOffset.Y)
{
offsetY = maxOffset.Y;
ViewportPosition.Y = -offsetY;
}
}
if (mouseInside && scrollBarWidth < 6)
scrollBarWidth++;
else if (!mouseInside && scrollBarWidth > 0 && !scrollbarSelected)
scrollBarWidth--;
if (isMouseInsideScrollbarArea && scrollbarClickLocation && !scrollbarSelected)
{
float scrollHeight = float(Size.Y)*(float(Size.Y)/float(InnerSize.Y));
float scrollPos = 0;
if (-ViewportPosition.Y > 0)
scrollPos = float(Size.Y-scrollHeight)*(float(offsetY)/float(maxOffset.Y));
if (scrollbarInitialYClick <= scrollPos)
scrollbarClickLocation = -1;
else if (scrollbarInitialYClick >= scrollPos+scrollHeight)
scrollbarClickLocation = 1;
else
scrollbarClickLocation = 0;
offsetY += scrollbarClickLocation*scrollHeight/10;
ViewportPosition.Y -= scrollbarClickLocation*scrollHeight/10;
}
}