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#include "Scrollbar.hpp"
#include <iostream>
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;
Trigger = false;
ShouldApplyFocus = 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;
}
// Init default width and height
bar.width = bg.width;
bar.height = bg.height;
// Compute move table canvas
double MTCanvasHeight = status->CanvasHeight - status->ScrollbarWidth;
double MTCanvasWidth = status->CanvasWidth - status->ScrollbarWidth;
// Configure scrollbar width and height and determined if a scroll must be applied:
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;
}
// Ensure current scroll is valid (moves deletions, canvas resize etc...)
// If not, we correct it now
if(IsHorizontal){
// Check if we should not scroll but still an offset is applied to coordinates:
if(!shouldScroll && status->ScrollX>0){
status->ScrollX=0;
bar.x=bg.x;
}
// Else if we should scroll:
else if(shouldScroll){
double maxScroll=status->MoveTableMaxX-MTCanvasWidth;
// Check if we over scroll:
if((maxScroll+status->ScrollX)<0){
status->ScrollX=-maxScroll;
bar.x=bg.width-bar.width;
}
// If not sensure that scroll bar is at the correct location:
else {
// We add negative sign because ScrollY is negative:
double percent = (-status->ScrollX) / maxScroll;
bar.x=(bg.width - bar.width)*percent;
}
}
else {
status->ScrollX=0;
bar.x=0;
}
} else {
// Here same as previously but for vertical bar!
if(!shouldScroll && status->ScrollY>0){
status->ScrollY=0;
bar.y=bg.y;
}
else if(shouldScroll){
double maxScroll=status->MoveTableMaxY-MTCanvasHeight;
if((maxScroll+status->ScrollY)<0){
status->ScrollY=-maxScroll;
bar.y=bg.height-bar.height;
} else {
double percent = (-status->ScrollY) / maxScroll;
bar.y=(bg.height - bar.height)*percent;
}
} else {
status->ScrollY=0;
bar.y=0;
}
}
// Handle user scroll events:
if (shouldScroll) {
if(ShouldApplyFocus){
ApplyFocus();
}
else 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:
ShouldApplyFocus=false;
}
void Scrollbar::ApplyFocus(){
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:
FocusX-=MTCanvasWidth; // Do not scroll on first page
FocusX=std::max(0.0,FocusX); // Ensure focus is greater than 0
FocusX=std::min(FocusX,(status->MoveTableMaxX-MTCanvasWidth)); // Ensure focus is than scroll max
// Then compute percent and apply scroll
double percent = FocusX / (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:
FocusY-=MTCanvasHeight; // Do not scroll on first page
FocusY=std::max(0.0,FocusY); // Ensure focus is greater than 0
FocusY=std::min(FocusY,(status->MoveTableMaxY-MTCanvasHeight)); // Ensure focus is than scroll max
// Then compute percent and apply scroll
double percent = FocusY / (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);
}
}
void Scrollbar::Focus(double XorY){
if(IsHorizontal)
FocusX=XorY;
else
FocusY=XorY;
ShouldApplyFocus=true;
}
void Scrollbar::Reset(){
if(IsHorizontal){
status->ScrollX=0;
bar.x=bg.x;
}else{
status->ScrollY=0;
bar.y=bg.y;
}
}
} // namespace cgeditor
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