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ladybird/Userland/Libraries/LibGUI/IconView.cpp
Andreas Kling 64d4921f35 LibGUI: Don't try to paint items in model-less IconView :^) 
Fixes #6079.
2021-04-03 20:36:43 +02:00

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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/StringBuilder.h>
#include <AK/Utf8View.h>
#include <LibCore/Timer.h>
#include <LibGUI/DragOperation.h>
#include <LibGUI/IconView.h>
#include <LibGUI/Model.h>
#include <LibGUI/Painter.h>
#include <LibGUI/ScrollBar.h>
#include <LibGfx/Palette.h>
namespace GUI {
IconView::IconView()
{
set_fill_with_background_color(true);
set_background_role(ColorRole::Base);
set_foreground_role(ColorRole::BaseText);
horizontal_scrollbar().set_visible(false);
}
IconView::~IconView()
{
}
void IconView::select_all()
{
for (int item_index = 0; item_index < item_count(); ++item_index) {
auto& item_data = m_item_data_cache[item_index];
if (!item_data.selected) {
if (item_data.is_valid())
add_selection(item_data);
else
add_selection(model()->index(item_index, model_column()));
}
}
}
void IconView::scroll_into_view(const ModelIndex& index, bool scroll_horizontally, bool scroll_vertically)
{
if (!index.is_valid())
return;
ScrollableWidget::scroll_into_view(item_rect(index.row()), scroll_horizontally, scroll_vertically);
}
void IconView::resize_event(ResizeEvent& event)
{
AbstractView::resize_event(event);
update_content_size();
if (!m_had_valid_size) {
m_had_valid_size = true;
if (!selection().is_empty())
scroll_into_view(selection().first());
}
}
void IconView::reinit_item_cache() const
{
auto prev_item_count = m_item_data_cache.size();
size_t new_item_count = item_count();
auto items_to_invalidate = min(prev_item_count, new_item_count);
// if the new number of items is less, check if any of the
// ones not in the list anymore was selected
for (size_t i = new_item_count; i < m_item_data_cache.size(); i++) {
auto& item_data = m_item_data_cache[i];
if (item_data.selected) {
VERIFY(m_selected_count_cache > 0);
m_selected_count_cache--;
}
}
if ((size_t)m_first_selected_hint >= new_item_count)
m_first_selected_hint = 0;
m_item_data_cache.resize(new_item_count);
for (size_t i = 0; i < items_to_invalidate; i++) {
auto& item_data = m_item_data_cache[i];
// TODO: It's unfortunate that we have no way to know whether any
// data actually changed, so we have to invalidate *everyone*
if (item_data.is_valid() /* && !model()->is_valid(item_data.index)*/)
item_data.invalidate();
if (item_data.selected && i < (size_t)m_first_selected_hint)
m_first_selected_hint = (int)i;
}
m_item_data_cache_valid = true;
}
auto IconView::get_item_data(int item_index) const -> ItemData&
{
if (!m_item_data_cache_valid)
reinit_item_cache();
auto& item_data = m_item_data_cache[item_index];
if (item_data.is_valid())
return item_data;
item_data.index = model()->index(item_index, model_column());
item_data.text = item_data.index.data().to_string();
get_item_rects(item_index, item_data, font_for_index(item_data.index));
item_data.valid = true;
return item_data;
}
auto IconView::item_data_from_content_position(const Gfx::IntPoint& content_position) const -> ItemData*
{
if (!m_visual_row_count || !m_visual_column_count)
return nullptr;
int row, column;
column_row_from_content_position(content_position, row, column);
int item_index = (m_flow_direction == FlowDirection::LeftToRight)
? row * m_visual_column_count + column
: column * m_visual_row_count + row;
if (item_index < 0 || item_index >= item_count())
return nullptr;
return &get_item_data(item_index);
}
void IconView::model_did_update(unsigned flags)
{
AbstractView::model_did_update(flags);
if (!model() || (flags & GUI::Model::InvalidateAllIndexes)) {
m_item_data_cache.clear();
AbstractView::clear_selection();
m_selected_count_cache = 0;
m_first_selected_hint = 0;
}
m_item_data_cache_valid = false;
update_content_size();
update();
}
void IconView::update_content_size()
{
if (!model())
return set_content_size({});
int content_width;
int content_height;
if (m_flow_direction == FlowDirection::LeftToRight) {
m_visual_column_count = max(1, available_size().width() / effective_item_size().width());
if (m_visual_column_count)
m_visual_row_count = ceil_div(model()->row_count(), m_visual_column_count);
else
m_visual_row_count = 0;
content_width = m_visual_column_count * effective_item_size().width();
content_height = m_visual_row_count * effective_item_size().height();
} else {
m_visual_row_count = max(1, available_size().height() / effective_item_size().height());
if (m_visual_row_count)
m_visual_column_count = ceil_div(model()->row_count(), m_visual_row_count);
else
m_visual_column_count = 0;
content_width = m_visual_column_count * effective_item_size().width();
content_height = available_size().height();
}
set_content_size({ content_width, content_height });
if (!m_item_data_cache_valid)
reinit_item_cache();
for (int item_index = 0; item_index < item_count(); item_index++) {
auto& item_data = m_item_data_cache[item_index];
if (item_data.is_valid())
update_item_rects(item_index, item_data);
}
}
Gfx::IntRect IconView::item_rect(int item_index) const
{
if (!m_visual_row_count || !m_visual_column_count)
return {};
int visual_row_index;
int visual_column_index;
if (m_flow_direction == FlowDirection::LeftToRight) {
visual_row_index = item_index / m_visual_column_count;
visual_column_index = item_index % m_visual_column_count;
} else {
visual_row_index = item_index % m_visual_row_count;
visual_column_index = item_index / m_visual_row_count;
}
return {
visual_column_index * effective_item_size().width(),
visual_row_index * effective_item_size().height(),
effective_item_size().width(),
effective_item_size().height()
};
}
ModelIndex IconView::index_at_event_position(const Gfx::IntPoint& position) const
{
VERIFY(model());
auto adjusted_position = to_content_position(position);
if (auto item_data = item_data_from_content_position(adjusted_position)) {
if (item_data->is_containing(adjusted_position))
return item_data->index;
}
return {};
}
void IconView::mousedown_event(MouseEvent& event)
{
if (!model())
return AbstractView::mousedown_event(event);
if (event.button() != MouseButton::Left)
return AbstractView::mousedown_event(event);
auto index = index_at_event_position(event.position());
if (index.is_valid()) {
// We might start dragging this item, but not rubber-banding.
return AbstractView::mousedown_event(event);
}
if (event.modifiers() & Mod_Ctrl) {
m_rubber_banding_store_selection = true;
} else {
clear_selection();
m_rubber_banding_store_selection = false;
}
auto adjusted_position = to_content_position(event.position());
m_might_drag = false;
if (selection_mode() == SelectionMode::MultiSelection) {
m_rubber_banding = true;
m_rubber_band_origin = adjusted_position;
m_rubber_band_current = adjusted_position;
}
}
void IconView::mouseup_event(MouseEvent& event)
{
if (m_rubber_banding && event.button() == MouseButton::Left) {
m_rubber_banding = false;
if (m_out_of_view_timer)
m_out_of_view_timer->stop();
update(to_widget_rect(Gfx::IntRect::from_two_points(m_rubber_band_origin, m_rubber_band_current)));
}
AbstractView::mouseup_event(event);
}
bool IconView::update_rubber_banding(const Gfx::IntPoint& position)
{
auto adjusted_position = to_content_position(position);
if (m_rubber_band_current != adjusted_position) {
auto prev_rect = Gfx::IntRect::from_two_points(m_rubber_band_origin, m_rubber_band_current);
auto prev_rubber_band_fill_rect = prev_rect.shrunken(1, 1);
m_rubber_band_current = adjusted_position;
auto rubber_band_rect = Gfx::IntRect::from_two_points(m_rubber_band_origin, m_rubber_band_current);
auto rubber_band_fill_rect = rubber_band_rect.shrunken(1, 1);
for (auto& rect : prev_rubber_band_fill_rect.shatter(rubber_band_fill_rect))
update(to_widget_rect(rect.inflated(1, 1)));
for (auto& rect : rubber_band_fill_rect.shatter(prev_rubber_band_fill_rect))
update(to_widget_rect(rect.inflated(1, 1)));
// If the rectangle width or height is 0, we still want to be able
// to match the items in the path. An easy work-around for this
// is to simply set the width or height to 1
auto ensure_rect = [](Gfx::IntRect& rect) {
if (rect.width() <= 0)
rect.set_width(1);
if (rect.height() <= 0)
rect.set_height(1);
};
ensure_rect(prev_rect);
ensure_rect(rubber_band_rect);
// Clearing the entire selection every time is very expensive,
// determine what items may need to be deselected and what new
// items may need to be selected. Avoid a ton of allocations.
auto deselect_area = prev_rect.shatter(rubber_band_rect);
auto select_area = rubber_band_rect.shatter(prev_rect);
// Initialize all candidate's toggle flag. We need to know which
// items we touched because the various rectangles likely will
// contain the same item more than once
for_each_item_intersecting_rects(deselect_area, [](ItemData& item_data) -> IterationDecision {
item_data.selection_toggled = false;
return IterationDecision::Continue;
});
for_each_item_intersecting_rects(select_area, [](ItemData& item_data) -> IterationDecision {
item_data.selection_toggled = false;
return IterationDecision::Continue;
});
// We're changing the selection and invalidating those items, so
// no need to trigger a full re-render for each item
set_suppress_update_on_selection_change(true);
// Now toggle all items that are no longer in the selected area, once only
for_each_item_intersecting_rects(deselect_area, [&](ItemData& item_data) -> IterationDecision {
if (!item_data.selection_toggled && item_data.is_intersecting(prev_rect) && !item_data.is_intersecting(rubber_band_rect)) {
item_data.selection_toggled = true;
toggle_selection(item_data);
update(to_widget_rect(item_data.rect()));
}
return IterationDecision::Continue;
});
// Now toggle all items that are in the new selected area, once only
for_each_item_intersecting_rects(select_area, [&](ItemData& item_data) -> IterationDecision {
if (!item_data.selection_toggled && !item_data.is_intersecting(prev_rect) && item_data.is_intersecting(rubber_band_rect)) {
item_data.selection_toggled = true;
toggle_selection(item_data);
update(to_widget_rect(item_data.rect()));
}
return IterationDecision::Continue;
});
set_suppress_update_on_selection_change(false);
return true;
}
return false;
}
#define SCROLL_OUT_OF_VIEW_HOT_MARGIN 20
void IconView::mousemove_event(MouseEvent& event)
{
if (!model())
return AbstractView::mousemove_event(event);
if (m_rubber_banding) {
auto in_view_rect = widget_inner_rect();
in_view_rect.shrink(SCROLL_OUT_OF_VIEW_HOT_MARGIN, SCROLL_OUT_OF_VIEW_HOT_MARGIN);
if (!in_view_rect.contains(event.position())) {
if (!m_out_of_view_timer) {
m_out_of_view_timer = add<Core::Timer>();
m_out_of_view_timer->set_interval(100);
m_out_of_view_timer->on_timeout = [this] {
scroll_out_of_view_timer_fired();
};
}
m_out_of_view_position = event.position();
if (!m_out_of_view_timer->is_active())
m_out_of_view_timer->start();
} else {
if (m_out_of_view_timer)
m_out_of_view_timer->stop();
}
if (update_rubber_banding(event.position()))
return;
}
AbstractView::mousemove_event(event);
}
void IconView::scroll_out_of_view_timer_fired()
{
auto scroll_to = to_content_position(m_out_of_view_position);
// Adjust the scroll-to position by SCROLL_OUT_OF_VIEW_HOT_MARGIN / 2
// depending on which direction we're scrolling. This allows us to
// start scrolling before we actually leave the visible area, which
// is important when there is no space to further move the mouse. The
// speed of scrolling is determined by the distance between the mouse
// pointer and the widget's inner rect shrunken by the hot margin
auto in_view_rect = widget_inner_rect().shrunken(SCROLL_OUT_OF_VIEW_HOT_MARGIN, SCROLL_OUT_OF_VIEW_HOT_MARGIN);
int adjust_x = 0, adjust_y = 0;
if (m_out_of_view_position.y() > in_view_rect.bottom())
adjust_y = (SCROLL_OUT_OF_VIEW_HOT_MARGIN / 2) + min(SCROLL_OUT_OF_VIEW_HOT_MARGIN, m_out_of_view_position.y() - in_view_rect.bottom());
else if (m_out_of_view_position.y() < in_view_rect.top())
adjust_y = -(SCROLL_OUT_OF_VIEW_HOT_MARGIN / 2) + max(-SCROLL_OUT_OF_VIEW_HOT_MARGIN, m_out_of_view_position.y() - in_view_rect.top());
if (m_out_of_view_position.x() > in_view_rect.right())
adjust_x = (SCROLL_OUT_OF_VIEW_HOT_MARGIN / 2) + min(SCROLL_OUT_OF_VIEW_HOT_MARGIN, m_out_of_view_position.x() - in_view_rect.right());
else if (m_out_of_view_position.x() < in_view_rect.left())
adjust_x = -(SCROLL_OUT_OF_VIEW_HOT_MARGIN / 2) + max(-SCROLL_OUT_OF_VIEW_HOT_MARGIN, m_out_of_view_position.x() - in_view_rect.left());
ScrollableWidget::scroll_into_view({ scroll_to.translated(adjust_x, adjust_y), { 1, 1 } }, true, true);
update_rubber_banding(m_out_of_view_position);
}
void IconView::update_item_rects(int item_index, ItemData& item_data) const
{
auto item_rect = this->item_rect(item_index);
item_data.icon_rect.center_within(item_rect);
item_data.icon_rect.move_by(0, item_data.icon_offset_y);
item_data.text_rect.center_horizontally_within(item_rect);
item_data.text_rect.set_top(item_rect.y() + item_data.text_offset_y);
}
Gfx::IntRect IconView::content_rect(const ModelIndex& index) const
{
if (!index.is_valid())
return {};
auto& item_data = get_item_data(index.row());
return item_data.text_rect.inflated(4, 4);
}
void IconView::did_change_hovered_index(const ModelIndex& old_index, const ModelIndex& new_index)
{
AbstractView::did_change_hovered_index(old_index, new_index);
if (old_index.is_valid())
get_item_rects(old_index.row(), get_item_data(old_index.row()), font_for_index(old_index));
if (new_index.is_valid())
get_item_rects(new_index.row(), get_item_data(new_index.row()), font_for_index(new_index));
}
void IconView::did_change_cursor_index(const ModelIndex& old_index, const ModelIndex& new_index)
{
AbstractView::did_change_cursor_index(old_index, new_index);
if (old_index.is_valid())
get_item_rects(old_index.row(), get_item_data(old_index.row()), font_for_index(old_index));
if (new_index.is_valid())
get_item_rects(new_index.row(), get_item_data(new_index.row()), font_for_index(new_index));
}
void IconView::get_item_rects(int item_index, ItemData& item_data, const Gfx::Font& font) const
{
auto item_rect = this->item_rect(item_index);
item_data.icon_rect = { 0, 0, 32, 32 };
item_data.icon_rect.center_within(item_rect);
item_data.icon_offset_y = -font.glyph_height() - 6;
item_data.icon_rect.move_by(0, item_data.icon_offset_y);
int unwrapped_text_width = font.width(item_data.text);
int available_width = item_rect.width() - 6;
item_data.text_rect = { 0, item_data.icon_rect.bottom() + 6 + 1, 0, font.glyph_height() };
item_data.wrapped_text_lines.clear();
if ((unwrapped_text_width > available_width) && (item_data.selected || m_hovered_index == item_data.index || cursor_index() == item_data.index || m_always_wrap_item_labels)) {
int current_line_width = 0;
int current_line_start = 0;
int widest_line_width = 0;
Utf8View utf8_view(item_data.text);
auto it = utf8_view.begin();
for (; it != utf8_view.end(); ++it) {
auto codepoint = *it;
auto glyph_width = font.glyph_width(codepoint);
if ((current_line_width + glyph_width + font.glyph_spacing()) > available_width) {
item_data.wrapped_text_lines.append(item_data.text.substring_view(current_line_start, utf8_view.byte_offset_of(it) - current_line_start));
current_line_start = utf8_view.byte_offset_of(it);
current_line_width = glyph_width;
} else {
current_line_width += glyph_width + font.glyph_spacing();
}
widest_line_width = max(widest_line_width, current_line_width);
}
if (current_line_width > 0) {
item_data.wrapped_text_lines.append(item_data.text.substring_view(current_line_start, utf8_view.byte_offset_of(it) - current_line_start));
}
item_data.text_rect.set_width(widest_line_width);
item_data.text_rect.center_horizontally_within(item_rect);
item_data.text_rect.intersect(item_rect);
item_data.text_rect.set_height(font.glyph_height() * item_data.wrapped_text_lines.size());
item_data.text_rect.inflate(6, 4);
} else {
item_data.text_rect.set_width(unwrapped_text_width);
item_data.text_rect.inflate(6, 4);
if (item_data.text_rect.width() > available_width)
item_data.text_rect.set_width(available_width);
item_data.text_rect.center_horizontally_within(item_rect);
}
item_data.text_rect.intersect(item_rect);
item_data.text_offset_y = item_data.text_rect.y() - item_rect.y();
}
void IconView::second_paint_event(PaintEvent& event)
{
if (!m_rubber_banding)
return;
Painter painter(*this);
painter.add_clip_rect(event.rect());
painter.add_clip_rect(widget_inner_rect());
painter.translate(frame_thickness(), frame_thickness());
painter.translate(-horizontal_scrollbar().value(), -vertical_scrollbar().value());
auto rubber_band_rect = Gfx::IntRect::from_two_points(m_rubber_band_origin, m_rubber_band_current);
painter.fill_rect(rubber_band_rect, palette().rubber_band_fill());
painter.draw_rect(rubber_band_rect, palette().rubber_band_border());
}
void IconView::paint_event(PaintEvent& event)
{
Color widget_background_color = palette().color(background_role());
Frame::paint_event(event);
Painter painter(*this);
painter.add_clip_rect(widget_inner_rect());
painter.add_clip_rect(event.rect());
painter.fill_rect(event.rect(), fill_with_background_color() ? widget_background_color : Color::Transparent);
if (!model())
return;
painter.translate(frame_thickness(), frame_thickness());
painter.translate(-horizontal_scrollbar().value(), -vertical_scrollbar().value());
auto selection_color = is_focused() ? palette().selection() : palette().inactive_selection();
for_each_item_intersecting_rect(to_content_rect(event.rect()), [&](auto& item_data) -> IterationDecision {
Color background_color;
if (item_data.selected) {
background_color = selection_color;
} else {
if (fill_with_background_color())
background_color = widget_background_color;
}
auto icon = item_data.index.data(ModelRole::Icon);
if (icon.is_icon()) {
if (auto bitmap = icon.as_icon().bitmap_for_size(item_data.icon_rect.width())) {
Gfx::IntRect destination = bitmap->rect();
destination.center_within(item_data.icon_rect);
if (item_data.selected) {
auto tint = selection_color.with_alpha(100);
painter.blit_filtered(destination.location(), *bitmap, bitmap->rect(), [&](auto src) { return src.blend(tint); });
} else if (m_hovered_index.is_valid() && m_hovered_index == item_data.index) {
painter.blit_brightened(destination.location(), *bitmap, bitmap->rect());
} else {
painter.blit(destination.location(), *bitmap, bitmap->rect());
}
}
}
auto font = font_for_index(item_data.index);
const auto& text_rect = item_data.text_rect;
painter.fill_rect(text_rect, background_color);
if (is_focused() && item_data.index == cursor_index()) {
painter.draw_rect(text_rect, widget_background_color);
painter.draw_focus_rect(text_rect, palette().focus_outline());
}
if (!item_data.wrapped_text_lines.is_empty()) {
// Item text would not fit in the item text rect, let's break it up into lines..
const auto& lines = item_data.wrapped_text_lines;
size_t number_of_text_lines = min((size_t)text_rect.height() / font->glyph_height(), lines.size());
for (size_t line_index = 0; line_index < number_of_text_lines; ++line_index) {
Gfx::IntRect line_rect;
line_rect.set_width(text_rect.width());
line_rect.set_height(font->glyph_height());
line_rect.center_horizontally_within(item_data.text_rect);
line_rect.set_y(2 + item_data.text_rect.y() + line_index * font->glyph_height());
line_rect.inflate(6, 0);
// Shrink the line_rect on the last line to apply elision if there are more lines.
if (number_of_text_lines - 1 == line_index && lines.size() > number_of_text_lines)
line_rect.inflate(-(6 + 2 * font->max_glyph_width()), 0);
draw_item_text(painter, item_data.index, item_data.selected, line_rect, lines[line_index], font, Gfx::TextAlignment::Center, Gfx::TextElision::Right);
}
} else {
draw_item_text(painter, item_data.index, item_data.selected, item_data.text_rect, item_data.text, font, Gfx::TextAlignment::Center, Gfx::TextElision::Right);
}
if (has_pending_drop() && item_data.index == drop_candidate_index()) {
// FIXME: This visualization is not great, as it's also possible to drop things on the text label..
painter.draw_rect(item_data.icon_rect.inflated(8, 8), palette().selection(), true);
}
return IterationDecision::Continue;
});
}
int IconView::item_count() const
{
if (!model())
return 0;
return model()->row_count();
}
void IconView::did_update_selection()
{
AbstractView::did_update_selection();
if (m_changing_selection)
return;
// Selection was modified externally, we need to synchronize our cache
do_clear_selection();
selection().for_each_index([&](const ModelIndex& index) {
if (index.is_valid()) {
auto item_index = model_index_to_item_index(index);
if ((size_t)item_index < m_item_data_cache.size())
do_add_selection(get_item_data(item_index));
}
});
}
void IconView::do_clear_selection()
{
for (size_t item_index = m_first_selected_hint; item_index < m_item_data_cache.size(); item_index++) {
if (m_selected_count_cache == 0)
break;
auto& item_data = m_item_data_cache[item_index];
if (!item_data.selected)
continue;
item_data.selected = false;
m_selected_count_cache--;
}
m_first_selected_hint = 0;
VERIFY(m_selected_count_cache == 0);
}
void IconView::clear_selection()
{
TemporaryChange change(m_changing_selection, true);
AbstractView::clear_selection();
do_clear_selection();
}
bool IconView::do_add_selection(ItemData& item_data)
{
if (!item_data.selected) {
item_data.selected = true;
m_selected_count_cache++;
int item_index = &item_data - &m_item_data_cache[0];
if (m_first_selected_hint > item_index)
m_first_selected_hint = item_index;
return true;
}
return false;
}
void IconView::add_selection(ItemData& item_data)
{
if (do_add_selection(item_data))
AbstractView::add_selection(item_data.index);
}
void IconView::add_selection(const ModelIndex& new_index)
{
TemporaryChange change(m_changing_selection, true);
auto item_index = model_index_to_item_index(new_index);
add_selection(get_item_data(item_index));
}
void IconView::toggle_selection(ItemData& item_data)
{
if (!item_data.selected)
add_selection(item_data);
else
remove_selection(item_data);
}
void IconView::toggle_selection(const ModelIndex& new_index)
{
TemporaryChange change(m_changing_selection, true);
auto item_index = model_index_to_item_index(new_index);
toggle_selection(get_item_data(item_index));
}
void IconView::remove_selection(ItemData& item_data)
{
if (!item_data.selected)
return;
TemporaryChange change(m_changing_selection, true);
item_data.selected = false;
VERIFY(m_selected_count_cache > 0);
m_selected_count_cache--;
int item_index = &item_data - &m_item_data_cache[0];
if (m_first_selected_hint == item_index) {
m_first_selected_hint = 0;
while ((size_t)item_index < m_item_data_cache.size()) {
if (m_item_data_cache[item_index].selected) {
m_first_selected_hint = item_index;
break;
}
item_index++;
}
}
AbstractView::remove_selection(item_data.index);
}
void IconView::set_selection(const ModelIndex& new_index)
{
TemporaryChange change(m_changing_selection, true);
do_clear_selection();
auto item_index = model_index_to_item_index(new_index);
auto& item_data = get_item_data(item_index);
item_data.selected = true;
m_selected_count_cache = 1;
if (item_index < m_first_selected_hint)
m_first_selected_hint = item_index;
AbstractView::set_selection(new_index);
}
int IconView::items_per_page() const
{
if (m_flow_direction == FlowDirection::LeftToRight)
return (visible_content_rect().height() / effective_item_size().height()) * m_visual_column_count;
return (visible_content_rect().width() / effective_item_size().width()) * m_visual_row_count;
}
void IconView::move_cursor(CursorMovement movement, SelectionUpdate selection_update)
{
if (!model())
return;
auto& model = *this->model();
if (!cursor_index().is_valid()) {
set_cursor(model.index(0, model_column()), SelectionUpdate::Set);
return;
}
auto new_row = cursor_index().row();
switch (movement) {
case CursorMovement::Right:
if (m_flow_direction == FlowDirection::LeftToRight)
new_row += 1;
else
new_row += m_visual_row_count;
break;
case CursorMovement::Left:
if (m_flow_direction == FlowDirection::LeftToRight)
new_row -= 1;
else
new_row -= m_visual_row_count;
break;
case CursorMovement::Up:
if (m_flow_direction == FlowDirection::LeftToRight)
new_row -= m_visual_column_count;
else
new_row -= 1;
break;
case CursorMovement::Down:
if (m_flow_direction == FlowDirection::LeftToRight)
new_row += m_visual_column_count;
else
new_row += 1;
break;
case CursorMovement::PageUp:
new_row = max(0, cursor_index().row() - items_per_page());
break;
case CursorMovement::PageDown:
new_row = min(model.row_count() - 1, cursor_index().row() + items_per_page());
break;
case CursorMovement::Home:
new_row = 0;
break;
case CursorMovement::End:
new_row = model.row_count() - 1;
break;
default:
return;
}
auto new_index = model.index(new_row, cursor_index().column());
if (new_index.is_valid())
set_cursor(new_index, selection_update);
}
void IconView::set_flow_direction(FlowDirection flow_direction)
{
if (m_flow_direction == flow_direction)
return;
m_flow_direction = flow_direction;
m_item_data_cache.clear();
m_item_data_cache_valid = false;
update();
}
template<typename Function>
inline IterationDecision IconView::for_each_item_intersecting_rect(const Gfx::IntRect& rect, Function f) const
{
VERIFY(model());
if (rect.is_empty())
return IterationDecision::Continue;
int begin_row, begin_column;
column_row_from_content_position(rect.top_left(), begin_row, begin_column);
int end_row, end_column;
column_row_from_content_position(rect.bottom_right(), end_row, end_column);
int items_per_flow_axis_step;
int item_index;
int last_index;
if (m_flow_direction == FlowDirection::LeftToRight) {
items_per_flow_axis_step = end_column - begin_column + 1;
item_index = max(0, begin_row * m_visual_column_count + begin_column);
last_index = min(item_count(), end_row * m_visual_column_count + end_column + 1);
} else {
items_per_flow_axis_step = end_row - begin_row + 1;
item_index = max(0, begin_column * m_visual_row_count + begin_row);
last_index = min(item_count(), end_column * m_visual_row_count + end_row + 1);
}
while (item_index < last_index) {
for (int i = item_index; i < min(item_index + items_per_flow_axis_step, last_index); i++) {
auto& item_data = get_item_data(i);
if (item_data.is_intersecting(rect)) {
auto decision = f(item_data);
if (decision != IterationDecision::Continue)
return decision;
}
}
item_index += (m_flow_direction == FlowDirection::LeftToRight) ? m_visual_column_count : m_visual_row_count;
};
return IterationDecision::Continue;
}
template<typename Function>
inline IterationDecision IconView::for_each_item_intersecting_rects(const Vector<Gfx::IntRect>& rects, Function f) const
{
for (auto& rect : rects) {
auto decision = for_each_item_intersecting_rect(rect, f);
if (decision != IterationDecision::Continue)
return decision;
}
return IterationDecision::Continue;
}
}
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