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#include "Scrollbar.hpp"
namespace cgeditor {
Scrollbar::Scrollbar(Status *s, bool IsHorizontal) : Component(s) {
this->IsHorizontal = IsHorizontal;
bg.prop = Property::Rectangle | Property::Scrollbarbg;
bar.prop = Property::Rectangle | Property::Scrollbar;
if (IsHorizontal) {
bg.prop |= Property::Horizontal;
bar.x = 0;
} else {
bar.y = 0;
}
DragX = 0;
DragY = 0;
CanvasWidth = 0;
CanvasHeight = 0;
Trigger = false;
}
void Scrollbar::Refresh() {
if (IsHorizontal) {
bg.y = status->CanvasHeight - status->ScrollbarWidth;
bg.width = status->CanvasWidth - status->ScrollbarWidth;
bg.height = status->ScrollbarWidth;
bar.y = bg.y;
} else {
bg.x = status->CanvasWidth - status->ScrollbarWidth;
bg.width = status->CanvasWidth;
bg.height = status->CanvasHeight - status->ScrollbarWidth;
bar.x = bg.x;
}
bar.width = bg.width;
bar.height = bg.height;
// Check if resize, in this case, reset everything (avoid bugs).
// Not that this will be executed during first draw also but it is fine:
if((CanvasWidth != status->CanvasWidth) || (CanvasWidth != status->CanvasWidth)){
status->ScrollX=0;
status->ScrollY=0;
bar.x=bg.x;
bar.y=bg.y;
}
// Compute move table canvas
double MTCanvasHeight = status->CanvasHeight - status->ScrollbarWidth;
double MTCanvasWidth = status->CanvasWidth - status->ScrollbarWidth;
bool shouldScroll = false;
if (!IsHorizontal && status->MoveTableMaxY > MTCanvasHeight) {
bar.height =
std::ceil(bg.height * (MTCanvasHeight / status->MoveTableMaxY));
shouldScroll = true;
}
if (IsHorizontal && status->MoveTableMaxX > MTCanvasWidth) {
bar.width = std::ceil(bg.width * (MTCanvasWidth / status->MoveTableMaxX));
shouldScroll = true;
}
if (shouldScroll) {
if (IsHorizontal && status->EventHScroll != 0) {
double percent = status->EventHScroll / status->MoveTableMaxX;
double maxScroll = bg.width - bar.width;
bar.x += maxScroll * percent;
bar.x = std::max(bg.x, bar.x);
bar.x = std::min(bg.x + maxScroll, bar.x);
double curScroll = bar.x - bg.x;
double scrollPercent = curScroll / maxScroll;
status->ScrollX =
-(status->MoveTableMaxX - MTCanvasWidth) * scrollPercent;
status->EventHScroll = 0;
} else if (status->EventVScroll != 0) {
double percent = status->EventVScroll / status->MoveTableMaxY;
double maxScroll = bg.height - bar.height;
bar.y += maxScroll * percent;
bar.y = std::max(bg.y, bar.y);
bar.y = std::min(bg.y + maxScroll, bar.y);
double curScroll = bar.y - bg.y;
double scrollPercent = curScroll / maxScroll;
status->ScrollY =
-(status->MoveTableMaxY - MTCanvasHeight) * scrollPercent;
status->EventVScroll = 0;
} else if (status->LeftClick &&
bar.IsOver(status->MouseX, status->MouseY)) {
DragX = bar.x;
DragY = bar.y;
Trigger = true;
} else if (Trigger && status->IsDrag) {
if (IsHorizontal) {
bar.x = DragX + (status->MouseX - status->LastMouseClicX);
bar.x = std::max(bg.x, bar.x);
double maxScroll = bg.width - bar.width;
bar.x = std::min(bg.x + maxScroll, bar.x);
double curScroll = bar.x - bg.x;
double scrollPercent = curScroll / maxScroll;
status->ScrollX =
-(status->MoveTableMaxX - MTCanvasWidth) * scrollPercent;
} else {
bar.y = DragY + (status->MouseY - status->LastMouseClicY);
bar.y = std::max(bg.y, bar.y);
double maxScroll = bg.height - bar.height;
bar.y = std::min(bg.y + maxScroll, bar.y);
double curScroll = bar.y - bg.y;
double scrollPercent = curScroll / maxScroll;
status->ScrollY =
-(status->MoveTableMaxY - MTCanvasHeight) * scrollPercent;
}
} else {
Trigger = false;
}
}
elements.clear();
elements.push_back(bg);
elements.push_back(bar);
// Update cache:
CanvasWidth = status->CanvasWidth;
CanvasHeight = status->CanvasHeight;
}
void Scrollbar::Focus(double XorY){
double MTCanvasHeight = status->CanvasHeight - status->ScrollbarWidth;
double MTCanvasWidth = status->CanvasWidth - status->ScrollbarWidth;
// Check horizontal or vertical and if should scroll
if(IsHorizontal && status->MoveTableMaxX > MTCanvasWidth){
// First normalize:
XorY-=MTCanvasWidth; // Do not scroll on first page
XorY=std::max(0.0,XorY); // Ensure focus is greater than 0
XorY=std::min(XorY,(status->MoveTableMaxX-MTCanvasWidth)); // Ensure focus is than scroll max
// Then compute percent and apply scroll
double percent = XorY / (status->MoveTableMaxX-MTCanvasWidth);
status->ScrollX =
-(status->MoveTableMaxX - MTCanvasWidth) * percent;
// Do not forget to update scrollbar:
double maxScroll = bg.width - bar.width;
bar.x = maxScroll * percent;
bar.x = std::max(bg.x, bar.x);
bar.x = std::min(bg.x + maxScroll, bar.x);
}
else if(status->MoveTableMaxY > MTCanvasHeight){
// First normalize:
XorY-=MTCanvasHeight; // Do not scroll on first page
XorY=std::max(0.0,XorY); // Ensure focus is greater than 0
XorY=std::min(XorY,(status->MoveTableMaxY-MTCanvasHeight)); // Ensure focus is than scroll max
// Then compute percent and apply scroll
double percent = XorY / (status->MoveTableMaxY-MTCanvasHeight);
status->ScrollY =
-(status->MoveTableMaxY - MTCanvasHeight) * percent;
// Do not forget to update scrollbar:
double maxScroll = bg.height - bar.height;
bar.y = maxScroll * percent;
bar.y = std::max(bg.y, bar.y);
bar.y = std::min(bg.y + maxScroll, bar.y);
}
}
} // namespace cgeditor
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