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Add scrollbar

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dec05eba
2024-09-08 19:41:47 +02:00
parent b145d957e3
commit 747344b858
2 changed files with 31 additions and 3 deletions
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32
src/gui/ScrollablePage.cpp
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@@ -1,13 +1,15 @@
#include "../../include/gui/ScrollablePage.hpp"
#include "../../include/gui/Utils.hpp"
#include "../../include/Theme.hpp"
#include <mglpp/window/Window.hpp>
#include <mglpp/window/Event.hpp>
//#include <mglpp/graphics/Rectangle.hpp>
#include <mglpp/graphics/Rectangle.hpp>
namespace gsr {
static const int scroll_speed = 80;
static const double scroll_update_speed = 10.0;
static const float scrollbar_width_scale = 0.004f;
ScrollablePage::ScrollablePage(mgl::vec2f size) : size(size) {}
@@ -50,6 +52,9 @@ namespace gsr {
return;
}
const double scrollbar_width = std::max(5.0f, scrollbar_width_scale * get_theme().window_height);
const mgl::vec2f scrollbar_pos = position + offset + mgl::vec2f(size.x - scrollbar_width, 0.0f);
offset = position + offset;
const mgl::vec2f page_scroll_start = offset;
@@ -97,6 +102,8 @@ namespace gsr {
const double child_height = child_bottom - child_top;
//fprintf(stderr, "scrollbar height: %f\n", scrollbar_height);
// Debug output
// mgl::Rectangle bottom(mgl::vec2f(size.x, 5.0f));
// bottom.set_color(mgl::Color(255, 0, 0, 255));
@@ -126,6 +133,29 @@ namespace gsr {
}
mgl_window_set_scissor(window.internal_window(), &prev_scissor);
double scrollbar_height = 1.0;
if(child_height > 0.001)
scrollbar_height = size.y / child_height;
if(scrollbar_height > 1.0)
scrollbar_height = 1.0;
if(scrollbar_height < 0.999) {
double scroll_amount = -scroll_y / (child_height - size.y);
if(scroll_amount < 0.0)
scroll_amount = 0.0;
else if(scroll_amount > 1.0)
scroll_amount = 1.0;
const double scrollbar_height_absolute = size.y * scrollbar_height;
const double scrollbar_empty_space = size.y - scrollbar_height_absolute;
mgl::Rectangle scrollbar(
(scrollbar_pos + mgl::vec2f(0.0f, scroll_amount * scrollbar_empty_space)).floor(),
mgl::vec2f(scrollbar_width, scrollbar_height_absolute).floor());
scrollbar.set_color(mgl::Color(200, 200, 200));
window.draw(scrollbar);
}
}
mgl::vec2f ScrollablePage::get_size() {