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ladybird/Userland/Libraries/LibGUI/IconView.cpp
speles d64d2e4d09 LibGUI: Scroll selection into view when the IconView is first laid out 
If we set selection before the IconView is laid out, it has no size.
So it can't correctly calculate where to scroll. Forcing scroll after
the first resize fixes that.
2021-03-07 11:00:36 +01:00

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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);
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);
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_visual_column_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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