Add zwidget
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Magnus Norddahl
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400
libraries/ZWidget/src/widgets/scrollbar/scrollbar.cpp
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400
libraries/ZWidget/src/widgets/scrollbar/scrollbar.cpp
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#include "widgets/scrollbar/scrollbar.h"
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#include "core/colorf.h"
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#include <stdexcept>
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Scrollbar::Scrollbar(Widget* parent) : Widget(parent)
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{
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UpdatePartPositions();
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mouse_down_timer = new Timer(this);
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mouse_down_timer->FuncExpired = [=]() { OnTimerExpired(); };
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}
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Scrollbar::~Scrollbar()
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{
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}
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bool Scrollbar::IsVertical() const
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{
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return vertical;
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}
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bool Scrollbar::IsHorizontal() const
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{
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return !vertical;
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}
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int Scrollbar::GetMin() const
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{
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return scroll_min;
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}
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int Scrollbar::GetMax() const
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{
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return scroll_max;
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}
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int Scrollbar::GetLineStep() const
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{
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return line_step;
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}
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int Scrollbar::GetPageStep() const
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{
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return page_step;
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}
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int Scrollbar::GetPosition() const
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{
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return position;
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}
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void Scrollbar::SetVertical()
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{
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vertical = true;
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if (UpdatePartPositions())
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Update();
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}
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void Scrollbar::SetHorizontal()
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{
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vertical = false;
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if (UpdatePartPositions())
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Update();
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}
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void Scrollbar::SetMin(int new_scroll_min)
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{
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SetRanges(new_scroll_min, scroll_max, line_step, page_step);
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}
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void Scrollbar::SetMax(int new_scroll_max)
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{
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SetRanges(scroll_min, new_scroll_max, line_step, page_step);
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}
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void Scrollbar::SetLineStep(int step)
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{
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SetRanges(scroll_min, scroll_max, step, page_step);
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}
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void Scrollbar::SetPageStep(int step)
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{
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SetRanges(scroll_min, scroll_max, line_step, step);
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}
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void Scrollbar::SetRanges(int scroll_min, int scroll_max, int line_step, int page_step)
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{
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if (scroll_min >= scroll_max || line_step <= 0 || page_step <= 0)
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throw std::runtime_error("Scrollbar ranges out of bounds!");
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scroll_min = scroll_min;
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scroll_max = scroll_max;
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line_step = line_step;
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page_step = page_step;
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if (position >= scroll_max)
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position = scroll_max - 1;
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if (position < scroll_min)
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position = scroll_min;
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if (UpdatePartPositions())
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Update();
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}
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void Scrollbar::SetRanges(int view_size, int total_size)
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{
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if (view_size <= 0 || total_size <= 0)
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{
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SetRanges(0, 1, 1, 1);
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}
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else
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{
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int scroll_max = std::max(1, total_size - view_size + 1);
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int page_step = std::max(1, view_size);
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SetRanges(0, scroll_max, 1, page_step);
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}
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}
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void Scrollbar::SetPosition(int pos)
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{
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position = pos;
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if (pos >= scroll_max)
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position = scroll_max - 1;
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if (pos < scroll_min)
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position = scroll_min;
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if (UpdatePartPositions())
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Update();
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}
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void Scrollbar::OnMouseMove(const Point& pos)
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{
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if (mouse_down_mode == mouse_down_thumb_drag)
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{
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int last_position = position;
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if (pos.x < -100 || pos.x > GetWidth() + 100 || pos.y < -100 || pos.y > GetHeight() + 100)
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{
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position = thumb_start_position;
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}
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else
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{
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int delta = (int)(vertical ? (pos.y - mouse_drag_start_pos.y) : (pos.x - mouse_drag_start_pos.x));
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int position_pixels = thumb_start_pixel_position + delta;
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int track_height = 0;
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if (vertical)
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track_height = (int)(rect_track_decrement.height + rect_track_increment.height);
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else
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track_height = (int)(rect_track_decrement.width + rect_track_increment.width);
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if (track_height != 0)
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position = scroll_min + position_pixels * (scroll_max - scroll_min) / track_height;
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else
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position = 0;
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if (position >= scroll_max)
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position = scroll_max - 1;
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if (position < scroll_min)
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position = scroll_min;
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}
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if (position != last_position)
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{
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InvokeScrollEvent(&FuncScrollThumbTrack);
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UpdatePartPositions();
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}
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}
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Update();
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}
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void Scrollbar::OnMouseDown(const Point& pos, int key)
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{
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mouse_drag_start_pos = pos;
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if (rect_button_decrement.contains(pos))
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{
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mouse_down_mode = mouse_down_button_decr;
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FuncScrollOnMouseDown = &FuncScrollLineDecrement;
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int last_position = position;
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position -= line_step;
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last_step_size = -line_step;
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if (position >= scroll_max)
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position = scroll_max - 1;
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if (position < scroll_min)
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position = scroll_min;
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if (last_position != position)
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InvokeScrollEvent(&FuncScrollLineDecrement);
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}
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else if (rect_button_increment.contains(pos))
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{
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mouse_down_mode = mouse_down_button_incr;
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FuncScrollOnMouseDown = &FuncScrollLineIncrement;
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int last_position = position;
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position += line_step;
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last_step_size = line_step;
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if (position >= scroll_max)
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position = scroll_max - 1;
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if (position < scroll_min)
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position = scroll_min;
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if (last_position != position)
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InvokeScrollEvent(&FuncScrollLineIncrement);
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}
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else if (rect_thumb.contains(pos))
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{
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mouse_down_mode = mouse_down_thumb_drag;
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thumb_start_position = position;
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thumb_start_pixel_position = (int)(vertical ? (rect_thumb.y - rect_track_decrement.y) : (rect_thumb.x - rect_track_decrement.x));
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}
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else if (rect_track_decrement.contains(pos))
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{
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mouse_down_mode = mouse_down_track_decr;
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FuncScrollOnMouseDown = &FuncScrollPageDecrement;
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int last_position = position;
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position -= page_step;
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last_step_size = -page_step;
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if (position >= scroll_max)
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position = scroll_max - 1;
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if (position < scroll_min)
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position = scroll_min;
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if (last_position != position)
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InvokeScrollEvent(&FuncScrollPageDecrement);
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}
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else if (rect_track_increment.contains(pos))
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{
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mouse_down_mode = mouse_down_track_incr;
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FuncScrollOnMouseDown = &FuncScrollPageIncrement;
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int last_position = position;
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position += page_step;
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last_step_size = page_step;
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if (position >= scroll_max)
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position = scroll_max - 1;
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if (position < scroll_min)
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position = scroll_min;
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if (last_position != position)
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InvokeScrollEvent(&FuncScrollPageIncrement);
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}
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mouse_down_timer->Start(100, false);
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UpdatePartPositions();
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Update();
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CaptureMouse();
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}
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void Scrollbar::OnMouseUp(const Point& pos, int key)
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{
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if (mouse_down_mode == mouse_down_thumb_drag)
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{
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if (FuncScrollThumbRelease)
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FuncScrollThumbRelease();
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}
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mouse_down_mode = mouse_down_none;
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mouse_down_timer->Stop();
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Update();
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ReleaseMouseCapture();
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}
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void Scrollbar::OnMouseLeave()
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{
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Update();
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}
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void Scrollbar::OnGeometryChanged()
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{
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UpdatePartPositions();
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}
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void Scrollbar::OnPaint(Canvas* canvas)
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{
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/*
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part_button_decrement.render_box(canvas, rect_button_decrement);
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part_track_decrement.render_box(canvas, rect_track_decrement);
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part_thumb.render_box(canvas, rect_thumb);
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part_thumb_gripper.render_box(canvas, rect_thumb);
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part_track_increment.render_box(canvas, rect_track_increment);
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part_button_increment.render_box(canvas, rect_button_increment);
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*/
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}
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// Calculates positions of all parts. Returns true if thumb position was changed compared to previously, false otherwise.
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bool Scrollbar::UpdatePartPositions()
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{
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int total_height = (int)(vertical ? GetHeight() : GetWidth());
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int track_height = std::max(0, total_height - decr_height - incr_height);
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int thumb_height = CalculateThumbSize(track_height);
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int thumb_offset = decr_height + CalculateThumbPosition(thumb_height, track_height);
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Rect previous_rect_thumb = rect_thumb;
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rect_button_decrement = CreateRect(0, decr_height);
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rect_track_decrement = CreateRect(decr_height, thumb_offset);
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rect_thumb = CreateRect(thumb_offset, thumb_offset + thumb_height);
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rect_track_increment = CreateRect(thumb_offset + thumb_height, decr_height + track_height);
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rect_button_increment = CreateRect(decr_height + track_height, decr_height + track_height + incr_height);
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return (previous_rect_thumb != rect_thumb);
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}
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int Scrollbar::CalculateThumbSize(int track_size)
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{
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int minimum_thumb_size = 20;
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int range = scroll_max - scroll_min;
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int length = range + page_step - 1;
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int thumb_size = page_step * track_size / length;
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if (thumb_size < minimum_thumb_size)
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thumb_size = minimum_thumb_size;
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if (thumb_size > track_size)
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thumb_size = track_size;
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return thumb_size;
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}
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int Scrollbar::CalculateThumbPosition(int thumb_size, int track_size)
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{
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int relative_pos = position - scroll_min;
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int range = scroll_max - scroll_min - 1;
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if (range != 0)
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{
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int available_area = std::max(0, track_size - thumb_size);
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return relative_pos * available_area / range;
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}
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else
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{
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return 0;
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}
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}
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Rect Scrollbar::CreateRect(int start, int end)
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{
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if (vertical)
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return Rect(0.0, start, GetWidth(), end - start);
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else
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return Rect(start, 0.0, end - start, GetHeight());
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}
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void Scrollbar::OnTimerExpired()
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{
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if (mouse_down_mode == mouse_down_thumb_drag)
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return;
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mouse_down_timer->Start(100, false);
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int last_position = position;
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position += last_step_size;
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if (position >= scroll_max)
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position = scroll_max - 1;
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if (position < scroll_min)
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position = scroll_min;
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if (position != last_position)
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{
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InvokeScrollEvent(FuncScrollOnMouseDown);
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if (UpdatePartPositions())
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Update();
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}
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}
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void Scrollbar::OnEnableChanged()
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{
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Update();
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}
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void Scrollbar::InvokeScrollEvent(std::function<void()>* event_ptr)
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{
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if (position == scroll_max - 1)
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{
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if (FuncScrollMax)
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FuncScrollMax();
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}
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if (position == scroll_min)
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{
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if (FuncScrollMin)
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FuncScrollMin();
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}
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if (FuncScroll)
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FuncScroll();
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if (event_ptr)
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(*event_ptr)();
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}
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