1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152
|
// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/views/widget/sublevel_manager.h"
#include <algorithm>
#include "build/build_config.h"
#include "ui/views/widget/native_widget_private.h"
#include "ui/views/widget/widget.h"
namespace {
bool ShouldStackAboveParent(views::Widget* widget) {
#if !BUILDFLAG(IS_MAC)
return false;
#else
// macOS bug: a child widget might be rendered behind its parent in fullscreen
// if the child is not explicitly StackAbove()'ed its parent.
int level = 0;
views::Widget* root = widget;
while (root->parent()) {
root = root->parent();
// StackAbove() will make `widget` visible. We don't want this when its
// ancestor is invisible.
if (!root->IsVisible()) {
return false;
}
level++;
}
// Only StackAbove() when `widget` is a grandchild (or deeper) of the root
// fullscreen window.
return level > 1 && root->IsFullscreen();
#endif
}
} // namespace
namespace views {
SublevelManager::SublevelManager(Widget* owner, int sublevel)
: owner_(owner), sublevel_(sublevel) {
owner_observation_.Observe(owner);
}
SublevelManager::~SublevelManager() = default;
void SublevelManager::SetSublevel(int sublevel) {
sublevel_ = sublevel;
EnsureOwnerSublevel();
}
int SublevelManager::GetSublevel() const {
return sublevel_;
}
void SublevelManager::EnsureOwnerSublevel() {
// Walk through the path to the root and ensure sublevel on every widget
// on the path. This is to work around the behavior on some platforms
// where showing an activatable widget brings its ancestors to the front.
Widget* parent = owner_->parent();
Widget* child = owner_;
while (parent && parent->GetSublevelManager()->IsTrackingChildWidget(child)) {
parent->GetSublevelManager()->OrderChildWidget(child);
child = parent;
parent = parent->parent();
}
}
void SublevelManager::EnsureOwnerTreeSublevel() {
for (Widget* child : children_) {
child->GetSublevelManager()->EnsureOwnerTreeSublevel();
}
if (Widget* parent = owner_->parent()) {
parent->GetSublevelManager()->OrderChildWidget(owner_);
}
}
void SublevelManager::OnWidgetChildAdded(Widget* owner, Widget* child) {
CHECK_EQ(owner, owner_);
CHECK(!base::Contains(children_, child));
CHECK_EQ(child->parent(), owner_);
children_.push_back(child);
}
void SublevelManager::OnWidgetChildRemoved(Widget* owner, Widget* child) {
CHECK_EQ(owner, owner_);
// During shutdown a child might get untracked more than once by the same
// parent. We don't want to DCHECK on that.
std::erase(children_, child);
}
void SublevelManager::OrderChildWidget(Widget* child) {
auto removed = std::ranges::remove(children_, child);
DCHECK_EQ(1u, removed.size());
children_.erase(removed.begin(), removed.end());
if (ShouldStackAboveParent(child)) {
child->StackAboveWidget(owner_);
}
ui::ZOrderLevel child_level = child->GetZOrderLevel();
auto insert_it = FindInsertPosition(child);
// Stacking above an invisible widget is a no-op on Mac. Therefore, find only
// visible ones.
auto find_visible_widget_of_same_level = [child_level](Widget* widget) {
return widget->IsVisible() && widget->GetZOrderLevel() == child_level;
};
auto prev_it = std::ranges::find_if(std::make_reverse_iterator(insert_it),
std::crend(children_),
find_visible_widget_of_same_level);
if (prev_it == children_.rend()) {
// x11 bug: stacking above the base `owner_` will cause `child` to become
// unresponsive after the base widget is minimized. As a workaround, we
// position `child` relative to the next child widget.
// Find the closest next widget at the same level.
auto next_it = std::ranges::find_if(insert_it, std::cend(children_),
find_visible_widget_of_same_level);
// Put `child` below `next_it`.
if (next_it != std::end(children_)) {
child->StackAboveWidget(*next_it);
(*next_it)->StackAboveWidget(child);
}
} else {
child->StackAboveWidget(*prev_it);
}
children_.insert(insert_it, child);
}
bool SublevelManager::IsTrackingChildWidget(Widget* child) {
return std::ranges::find(children_, child) != children_.end();
}
SublevelManager::ChildIterator SublevelManager::FindInsertPosition(
Widget* child) const {
ui::ZOrderLevel child_level = child->GetZOrderLevel();
int child_sublevel = child->GetZOrderSublevel();
return std::ranges::find_if(children_, [&](Widget* widget) {
return widget->GetZOrderLevel() == child_level &&
widget->GetZOrderSublevel() > child_sublevel;
});
}
} // namespace views
|