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LibGUI: Support dragging the GScrollBar scrubber.
This was pleasantly easy to implement with the global mouse tracking. :^)
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parent
6b8af2f33a
commit
9ea2131adf
Notes:
sideshowbarker
2024-07-19 15:48:42 +09:00
Author: https://github.com/awesomekling Commit: https://github.com/SerenityOS/serenity/commit/9ea2131adff
@ -55,23 +55,28 @@ Rect GScrollBar::down_button_rect() const
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return { 0, height() - button_size(), button_size(), button_size() };
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}
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Rect GScrollBar::pgup_rect() const
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Rect GScrollBar::upper_gutter_rect() const
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{
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return { 0, button_size(), button_size(), scrubber_rect().top() - button_size() };
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}
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Rect GScrollBar::pgdn_rect() const
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Rect GScrollBar::lower_gutter_rect() const
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{
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auto scrubber_rect = this->scrubber_rect();
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return { 0, scrubber_rect.bottom(), button_size(), height() - button_size() - scrubber_rect.bottom() };
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}
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int GScrollBar::scrubbable_range_in_pixels() const
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{
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return height() - button_size() * 3;
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}
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Rect GScrollBar::scrubber_rect() const
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{
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int range_size = m_max - m_min;
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if (range_size == 0)
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return { 0, button_size(), button_size(), height() - button_size() * 2 };
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float available_y = height() - button_size() * 3;
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float available_y = scrubbable_range_in_pixels();
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float y_step = available_y / range_size;
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float y = button_size() + (y_step * m_value);
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return { 0, (int)y, button_size(), button_size() };
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@ -115,7 +120,7 @@ void GScrollBar::paint_event(GPaintEvent&)
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Painter painter(*this);
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painter.fill_rect(rect(), Color::MidGray);
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painter.fill_rect(rect(), Color(164, 164, 164));
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painter.draw_rect(up_button_rect(), Color::DarkGray, true);
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painter.fill_rect_with_gradient(up_button_rect().shrunken(2, 2), Color::LightGray, Color::White);
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@ -141,12 +146,40 @@ void GScrollBar::mousedown_event(GMouseEvent& event)
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set_value(value() + m_step);
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return;
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}
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if (pgup_rect().contains(event.position())) {
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if (upper_gutter_rect().contains(event.position())) {
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set_value(value() - m_big_step);
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return;
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}
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if (pgdn_rect().contains(event.position())) {
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if (lower_gutter_rect().contains(event.position())) {
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set_value(value() + m_big_step);
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return;
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}
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if (scrubber_rect().contains(event.position())) {
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m_scrubbing = true;
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m_scrub_start_value = value();
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m_scrub_origin = event.position();
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set_global_cursor_tracking(true);
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return;
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}
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}
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void GScrollBar::mouseup_event(GMouseEvent& event)
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{
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if (event.button() != GMouseButton::Left)
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return;
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if (!m_scrubbing)
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return;
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m_scrubbing = false;
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set_global_cursor_tracking(false);
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}
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void GScrollBar::mousemove_event(GMouseEvent& event)
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{
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if (!m_scrubbing)
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return;
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float delta = event.y() - m_scrub_origin.y();
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float scrubbable_range = scrubbable_range_in_pixels();
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float value_steps_per_scrubbed_pixel = (m_max - m_min) / scrubbable_range;
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float new_value = m_scrub_start_value + (value_steps_per_scrubbed_pixel * delta);
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set_value(new_value);
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}
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@ -24,19 +24,25 @@ public:
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private:
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virtual void paint_event(GPaintEvent&) override;
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virtual void mousedown_event(GMouseEvent&) override;
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virtual void mouseup_event(GMouseEvent&) override;
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virtual void mousemove_event(GMouseEvent&) override;
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virtual const char* class_name() const override { return "GScrollBar"; }
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int button_size() const { return 16; }
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Rect up_button_rect() const;
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Rect down_button_rect() const;
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Rect pgup_rect() const;
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Rect pgdn_rect() const;
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Rect upper_gutter_rect() const;
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Rect lower_gutter_rect() const;
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Rect scrubber_rect() const;
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int scrubbable_range_in_pixels() const;
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int m_min { 0 };
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int m_max { 0 };
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int m_value { 0 };
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int m_step { 1 };
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int m_big_step { 5 };
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};
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bool m_scrubbing { false };
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int m_scrub_start_value { 0 };
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Point m_scrub_origin;
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};
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