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https://github.com/LadybirdBrowser/ladybird.git
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fc568ea13a
In order to calculate a thumb size that is a representation of the visible portion (page) of the content, that information needs to be taken into account.
393 lines
13 KiB
C++
393 lines
13 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <LibCore/Timer.h>
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#include <LibGUI/Painter.h>
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#include <LibGUI/ScrollBar.h>
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#include <LibGfx/CharacterBitmap.h>
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#include <LibGfx/Palette.h>
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#include <LibGfx/StylePainter.h>
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namespace GUI {
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static const char* s_up_arrow_bitmap_data = {
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" "
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" # "
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" ### "
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" ##### "
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" ####### "
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" ### "
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" ### "
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" ### "
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" "
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};
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static const char* s_down_arrow_bitmap_data = {
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" "
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" ### "
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" ### "
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" ### "
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" ####### "
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" ##### "
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" ### "
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" # "
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" "
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};
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static const char* s_left_arrow_bitmap_data = {
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" "
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" # "
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" ## "
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" ###### "
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" ####### "
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" ###### "
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" ## "
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" # "
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" "
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};
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static const char* s_right_arrow_bitmap_data = {
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" "
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" # "
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" ## "
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" ###### "
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" ####### "
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" ###### "
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" ## "
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" # "
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" "
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};
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static Gfx::CharacterBitmap* s_up_arrow_bitmap;
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static Gfx::CharacterBitmap* s_down_arrow_bitmap;
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static Gfx::CharacterBitmap* s_left_arrow_bitmap;
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static Gfx::CharacterBitmap* s_right_arrow_bitmap;
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ScrollBar::ScrollBar(Orientation orientation)
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: m_orientation(orientation)
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{
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m_automatic_scrolling_timer = add<Core::Timer>();
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if (!s_up_arrow_bitmap)
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s_up_arrow_bitmap = &Gfx::CharacterBitmap::create_from_ascii(s_up_arrow_bitmap_data, 9, 9).leak_ref();
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if (!s_down_arrow_bitmap)
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s_down_arrow_bitmap = &Gfx::CharacterBitmap::create_from_ascii(s_down_arrow_bitmap_data, 9, 9).leak_ref();
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if (!s_left_arrow_bitmap)
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s_left_arrow_bitmap = &Gfx::CharacterBitmap::create_from_ascii(s_left_arrow_bitmap_data, 9, 9).leak_ref();
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if (!s_right_arrow_bitmap)
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s_right_arrow_bitmap = &Gfx::CharacterBitmap::create_from_ascii(s_right_arrow_bitmap_data, 9, 9).leak_ref();
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if (m_orientation == Orientation::Vertical) {
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set_preferred_size(16, 0);
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} else {
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set_preferred_size(0, 16);
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}
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m_automatic_scrolling_timer->set_interval(100);
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m_automatic_scrolling_timer->on_timeout = [this] {
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on_automatic_scrolling_timer_fired();
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};
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}
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ScrollBar::~ScrollBar()
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{
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}
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void ScrollBar::set_range(int min, int max, int page)
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{
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ASSERT(min <= max);
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if (page < 0)
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page = 0;
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if (m_min == min && m_max == max && m_page == page)
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return;
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m_min = min;
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m_max = max;
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m_page = page;
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int old_value = m_value;
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m_value = clamp(m_value, m_min, m_max);
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if (on_change && m_value != old_value)
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on_change(m_value);
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update();
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}
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void ScrollBar::set_value(int value)
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{
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value = clamp(value, m_min, m_max);
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if (value == m_value)
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return;
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m_value = value;
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if (on_change)
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on_change(value);
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update();
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}
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Gfx::IntRect ScrollBar::decrement_button_rect() const
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{
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return { 0, 0, button_width(), button_height() };
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}
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Gfx::IntRect ScrollBar::increment_button_rect() const
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{
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if (orientation() == Orientation::Vertical)
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return { 0, height() - button_height(), button_width(), button_height() };
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else
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return { width() - button_width(), 0, button_width(), button_height() };
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}
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Gfx::IntRect ScrollBar::decrement_gutter_rect() const
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{
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if (orientation() == Orientation::Vertical)
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return { 0, button_height(), button_width(), scrubber_rect().top() - button_height() };
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else
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return { button_width(), 0, scrubber_rect().x() - button_width(), button_height() };
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}
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Gfx::IntRect ScrollBar::increment_gutter_rect() const
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{
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auto scrubber_rect = this->scrubber_rect();
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if (orientation() == Orientation::Vertical)
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return { 0, scrubber_rect.bottom() + 1, button_width(), height() - button_height() - scrubber_rect.bottom() - 1 };
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else
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return { scrubber_rect.right() + 1, 0, width() - button_width() - scrubber_rect.right() - 1, button_width() };
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}
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int ScrollBar::scrubbable_range_in_pixels() const
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{
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if (orientation() == Orientation::Vertical)
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return height() - button_height() * 2 - scrubber_size();
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else
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return width() - button_width() * 2 - scrubber_size();
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}
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bool ScrollBar::has_scrubber() const
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{
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return m_max != m_min;
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}
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int ScrollBar::scrubber_size() const
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{
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int pixel_range = length(orientation()) - button_size() * 2;
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int value_range = m_max - m_min;
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int scrubber_size = 0;
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if (value_range > 0) {
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// Scrubber size should be proportional to the visible portion
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// (page) in relation to the content (value range + page)
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scrubber_size = (m_page * pixel_range) / (value_range + m_page);
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}
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return ::max(scrubber_size, button_size());
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}
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Gfx::IntRect ScrollBar::scrubber_rect() const
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{
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if (!has_scrubber() || length(orientation()) <= (button_size() * 2) + scrubber_size())
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return {};
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float x_or_y;
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if (m_value == m_min)
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x_or_y = button_size();
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else if (m_value == m_max)
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x_or_y = (length(orientation()) - button_size() - scrubber_size()) + 1;
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else {
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float range_size = m_max - m_min;
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float available = scrubbable_range_in_pixels();
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float step = available / range_size;
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x_or_y = (button_size() + (step * m_value));
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}
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if (orientation() == Orientation::Vertical)
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return { 0, (int)x_or_y, button_width(), scrubber_size() };
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else
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return { (int)x_or_y, 0, scrubber_size(), button_height() };
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}
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void ScrollBar::paint_event(PaintEvent& event)
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{
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Painter painter(*this);
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painter.add_clip_rect(event.rect());
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painter.fill_rect_with_dither_pattern(rect(), palette().button().lightened(1.3f), palette().button());
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bool decrement_pressed = m_automatic_scrolling_direction == AutomaticScrollingDirection::Decrement;
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bool increment_pressed = m_automatic_scrolling_direction == AutomaticScrollingDirection::Increment;
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Gfx::StylePainter::paint_button(painter, decrement_button_rect(), palette(), Gfx::ButtonStyle::Normal, decrement_pressed, m_hovered_component == Component::DecrementButton);
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Gfx::StylePainter::paint_button(painter, increment_button_rect(), palette(), Gfx::ButtonStyle::Normal, increment_pressed, m_hovered_component == Component::IncrementButton);
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if (length(orientation()) > default_button_size()) {
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auto decrement_location = decrement_button_rect().location().translated(3, 3);
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if (decrement_pressed)
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decrement_location.move_by(1, 1);
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painter.draw_bitmap(decrement_location, orientation() == Orientation::Vertical ? *s_up_arrow_bitmap : *s_left_arrow_bitmap, has_scrubber() ? palette().button_text() : palette().threed_shadow1());
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auto increment_location = increment_button_rect().location().translated(3, 3);
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if (increment_pressed)
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increment_location.move_by(1, 1);
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painter.draw_bitmap(increment_location, orientation() == Orientation::Vertical ? *s_down_arrow_bitmap : *s_right_arrow_bitmap, has_scrubber() ? palette().button_text() : palette().threed_shadow1());
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}
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if (has_scrubber())
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Gfx::StylePainter::paint_button(painter, scrubber_rect(), palette(), Gfx::ButtonStyle::Normal, false, m_hovered_component == Component::Scrubber || m_scrubber_in_use);
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}
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void ScrollBar::on_automatic_scrolling_timer_fired()
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{
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if (m_automatic_scrolling_direction == AutomaticScrollingDirection::Decrement) {
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set_value(value() - m_step);
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return;
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}
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if (m_automatic_scrolling_direction == AutomaticScrollingDirection::Increment) {
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set_value(value() + m_step);
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return;
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}
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}
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void ScrollBar::mousedown_event(MouseEvent& event)
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{
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if (event.button() != MouseButton::Left)
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return;
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if (!has_scrubber())
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return;
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if (decrement_button_rect().contains(event.position())) {
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m_automatic_scrolling_direction = AutomaticScrollingDirection::Decrement;
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set_automatic_scrolling_active(true);
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update();
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return;
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}
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if (increment_button_rect().contains(event.position())) {
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m_automatic_scrolling_direction = AutomaticScrollingDirection::Increment;
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set_automatic_scrolling_active(true);
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update();
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return;
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}
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if (scrubber_rect().contains(event.position())) {
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m_scrubber_in_use = true;
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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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update();
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return;
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}
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float range_size = m_max - m_min;
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float available = scrubbable_range_in_pixels();
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float x = ::max(0, event.position().x() - button_width() - button_width() / 2);
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float y = ::max(0, event.position().y() - button_height() - button_height() / 2);
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float rel_x = x / available;
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float rel_y = y / available;
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if (orientation() == Orientation::Vertical)
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set_value(m_min + rel_y * range_size);
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else
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set_value(m_min + rel_x * range_size);
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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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}
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void ScrollBar::mouseup_event(MouseEvent& event)
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{
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if (event.button() != MouseButton::Left)
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return;
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m_scrubber_in_use = false;
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m_automatic_scrolling_direction = AutomaticScrollingDirection::None;
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set_automatic_scrolling_active(false);
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m_scrubbing = false;
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update();
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}
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void ScrollBar::mousewheel_event(MouseEvent& event)
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{
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if (!is_scrollable())
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return;
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set_value(value() + event.wheel_delta() * m_step);
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Widget::mousewheel_event(event);
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}
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void ScrollBar::set_automatic_scrolling_active(bool active)
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{
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if (active) {
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on_automatic_scrolling_timer_fired();
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m_automatic_scrolling_timer->start();
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} else {
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m_automatic_scrolling_timer->stop();
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}
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}
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void ScrollBar::mousemove_event(MouseEvent& event)
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{
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auto old_hovered_component = m_hovered_component;
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if (scrubber_rect().contains(event.position()))
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m_hovered_component = Component::Scrubber;
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else if (decrement_button_rect().contains(event.position()))
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m_hovered_component = Component::DecrementButton;
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else if (increment_button_rect().contains(event.position()))
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m_hovered_component = Component::IncrementButton;
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else if (rect().contains(event.position()))
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m_hovered_component = Component::Gutter;
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else
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m_hovered_component = Component::Invalid;
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if (old_hovered_component != m_hovered_component) {
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update();
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if (m_automatic_scrolling_direction == AutomaticScrollingDirection::Decrement)
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set_automatic_scrolling_active(m_hovered_component == Component::DecrementButton);
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else if (m_automatic_scrolling_direction == AutomaticScrollingDirection::Increment)
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set_automatic_scrolling_active(m_hovered_component == Component::IncrementButton);
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}
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if (!m_scrubbing)
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return;
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float delta = orientation() == Orientation::Vertical ? (event.y() - m_scrub_origin.y()) : (event.x() - m_scrub_origin.x());
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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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void ScrollBar::leave_event(Core::Event&)
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{
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if (m_hovered_component != Component::Invalid) {
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m_hovered_component = Component::Invalid;
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update();
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}
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}
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void ScrollBar::change_event(Event& event)
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{
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if (event.type() == Event::Type::EnabledChange) {
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if (!is_enabled())
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m_scrubbing = false;
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}
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return Widget::change_event(event);
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}
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}
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