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// Copyright 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ui/views/frame/browser_view_layout.h"
#include <algorithm>
#include "base/observer_list.h"
#include "base/stl_util.h"
#include "base/trace_event/common/trace_event_common.h"
#include "build/build_config.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_finder.h"
#include "chrome/browser/ui/browser_window.h"
#include "chrome/browser/ui/find_bar/find_bar.h"
#include "chrome/browser/ui/find_bar/find_bar_controller.h"
#include "chrome/browser/ui/layout_constants.h"
#include "chrome/browser/ui/views/bookmarks/bookmark_bar_view.h"
#include "chrome/browser/ui/views/download/download_shelf_view.h"
#include "chrome/browser/ui/views/exclusive_access_bubble_views.h"
#include "chrome/browser/ui/views/frame/browser_non_client_frame_view.h"
#include "chrome/browser/ui/views/frame/browser_view_layout_delegate.h"
#include "chrome/browser/ui/views/frame/contents_layout_manager.h"
#include "chrome/browser/ui/views/frame/immersive_mode_controller.h"
#include "chrome/browser/ui/views/frame/tab_strip_region_view.h"
#include "chrome/browser/ui/views/frame/top_container_view.h"
#include "chrome/browser/ui/views/infobars/infobar_container_view.h"
#include "chrome/browser/ui/views/tabs/tab_strip.h"
#include "chrome/browser/ui/views/toolbar/toolbar_view.h"
#include "components/web_modal/web_contents_modal_dialog_host.h"
#include "ui/base/hit_test.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"
#include "ui/views/controls/webview/webview.h"
#include "ui/views/widget/widget.h"
#include "ui/views/window/client_view.h"
using views::View;
using web_modal::WebContentsModalDialogHost;
using web_modal::ModalDialogHostObserver;
namespace {
// The visible height of the shadow above the tabs. Clicks in this area are
// treated as clicks to the frame, rather than clicks to the tab.
const int kTabShadowSize = 2;
// The number of pixels the constrained window should overlap the bottom
// of the omnibox.
const int kConstrainedWindowOverlap = 3;
// Combines View::ConvertPointToTarget and View::HitTest for a given |point|.
// Converts |point| from |src| to |dst| and hit tests it against |dst|. The
// converted |point| can then be retrieved and used for additional tests.
bool ConvertedHitTest(views::View* src, views::View* dst, gfx::Point* point) {
DCHECK(src);
DCHECK(dst);
DCHECK(point);
views::View::ConvertPointToTarget(src, dst, point);
return dst->HitTestPoint(*point);
}
} // namespace
constexpr int BrowserViewLayout::kMainBrowserContentsMinimumWidth;
class BrowserViewLayout::WebContentsModalDialogHostViews
: public WebContentsModalDialogHost {
public:
explicit WebContentsModalDialogHostViews(
BrowserViewLayout* browser_view_layout)
: browser_view_layout_(browser_view_layout) {
}
~WebContentsModalDialogHostViews() override {
for (ModalDialogHostObserver& observer : observer_list_)
observer.OnHostDestroying();
}
void NotifyPositionRequiresUpdate() {
for (ModalDialogHostObserver& observer : observer_list_)
observer.OnPositionRequiresUpdate();
}
gfx::Point GetDialogPosition(const gfx::Size& size) override {
views::View* view = browser_view_layout_->contents_container_;
gfx::Rect content_area = view->ConvertRectToWidget(view->GetLocalBounds());
const int middle_x = content_area.x() + content_area.width() / 2;
const int top = browser_view_layout_->web_contents_modal_dialog_top_y_;
return gfx::Point(middle_x - size.width() / 2, top);
}
bool ShouldActivateDialog() const override {
// The browser Widget may be inactive if showing a bubble so instead check
// against the last active browser window when determining whether to
// activate the dialog.
return chrome::FindLastActive() ==
browser_view_layout_->browser_view_->browser();
}
gfx::Size GetMaximumDialogSize() override {
views::View* view = browser_view_layout_->contents_container_;
gfx::Rect content_area = view->ConvertRectToWidget(view->GetLocalBounds());
const int top = browser_view_layout_->web_contents_modal_dialog_top_y_;
return gfx::Size(content_area.width(), content_area.bottom() - top);
}
private:
gfx::NativeView GetHostView() const override {
return browser_view_layout_->host_view_;
}
// Add/remove observer.
void AddObserver(ModalDialogHostObserver* observer) override {
observer_list_.AddObserver(observer);
}
void RemoveObserver(ModalDialogHostObserver* observer) override {
observer_list_.RemoveObserver(observer);
}
BrowserViewLayout* const browser_view_layout_;
base::ObserverList<ModalDialogHostObserver>::Unchecked observer_list_;
DISALLOW_COPY_AND_ASSIGN(WebContentsModalDialogHostViews);
};
////////////////////////////////////////////////////////////////////////////////
// BrowserViewLayout, public:
BrowserViewLayout::BrowserViewLayout(
std::unique_ptr<BrowserViewLayoutDelegate> delegate,
gfx::NativeView host_view,
BrowserView* browser_view,
views::View* top_container,
TabStripRegionView* tab_strip_region_view,
TabStrip* tab_strip,
views::View* toolbar,
InfoBarContainerView* infobar_container,
views::View* contents_container,
views::View* side_panel,
ImmersiveModeController* immersive_mode_controller,
views::View* web_footer_experiment,
views::View* contents_separator)
: delegate_(std::move(delegate)),
host_view_(host_view),
browser_view_(browser_view),
top_container_(top_container),
tab_strip_region_view_(tab_strip_region_view),
toolbar_(toolbar),
infobar_container_(infobar_container),
contents_container_(contents_container),
side_panel_(side_panel),
immersive_mode_controller_(immersive_mode_controller),
web_footer_experiment_(web_footer_experiment),
contents_separator_(contents_separator),
tab_strip_(tab_strip),
dialog_host_(std::make_unique<WebContentsModalDialogHostViews>(this)) {}
BrowserViewLayout::~BrowserViewLayout() = default;
WebContentsModalDialogHost*
BrowserViewLayout::GetWebContentsModalDialogHost() {
return dialog_host_.get();
}
gfx::Size BrowserViewLayout::GetMinimumSize(const views::View* host) const {
// Prevent having a 0x0 sized-contents as this can allow the window to be
// resized down such that it's invisible and can no longer accept events.
// Use a very small 1x1 size to allow the user and the web contents to be able
// to resize the window as small as possible without introducing bugs.
// https://crbug.com/847179.
constexpr gfx::Size kContentsMinimumSize(1, 1);
// The minimum height for the normal (tabbed) browser window's contents area.
constexpr int kMainBrowserContentsMinimumHeight = 1;
const bool has_tabstrip =
delegate_->SupportsWindowFeature(Browser::FEATURE_TABSTRIP);
const bool has_toolbar =
delegate_->SupportsWindowFeature(Browser::FEATURE_TOOLBAR);
const bool has_location_bar =
delegate_->SupportsWindowFeature(Browser::FEATURE_LOCATIONBAR);
const bool has_bookmarks_bar =
bookmark_bar_ && bookmark_bar_->GetVisible() &&
delegate_->SupportsWindowFeature(Browser::FEATURE_BOOKMARKBAR);
gfx::Size tabstrip_size(
has_tabstrip ? tab_strip_region_view_->GetMinimumSize() : gfx::Size());
gfx::Size toolbar_size((has_toolbar || has_location_bar)
? toolbar_->GetMinimumSize()
: gfx::Size());
gfx::Size bookmark_bar_size;
if (has_bookmarks_bar)
bookmark_bar_size = bookmark_bar_->GetMinimumSize();
gfx::Size infobar_container_size(infobar_container_->GetMinimumSize());
// TODO(pkotwicz): Adjust the minimum height for the find bar.
gfx::Size contents_size(contents_container_->GetMinimumSize());
contents_size.SetToMax(delegate_->BrowserIsTypeNormal()
? gfx::Size(kMainBrowserContentsMinimumWidth,
kMainBrowserContentsMinimumHeight)
: kContentsMinimumSize);
const int min_height =
delegate_->GetTopInsetInBrowserView() + tabstrip_size.height() +
toolbar_size.height() + bookmark_bar_size.height() +
infobar_container_size.height() + contents_size.height();
const int min_width = std::max(
{tabstrip_size.width(), toolbar_size.width(), bookmark_bar_size.width(),
infobar_container_size.width(), contents_size.width()});
return gfx::Size(min_width, min_height);
}
gfx::NativeView BrowserViewLayout::GetHostView() {
return delegate_->GetHostView();
}
int BrowserViewLayout::NonClientHitTest(const gfx::Point& point) {
// Since the TabStrip only renders in some parts of the top of the window,
// the un-obscured area is considered to be part of the non-client caption
// area of the window. So we need to treat hit-tests in these regions as
// hit-tests of the titlebar.
views::View* parent = browser_view_->parent();
gfx::Point point_in_browser_view_coords(point);
views::View::ConvertPointToTarget(
parent, browser_view_, &point_in_browser_view_coords);
// Determine if the TabStrip exists and is capable of being clicked on. We
// might be a popup window without a TabStrip.
if (delegate_->IsTabStripVisible()) {
// See if the mouse pointer is within the bounds of the TabStripRegionView.
gfx::Point test_point(point);
if (ConvertedHitTest(parent, tab_strip_region_view_, &test_point)) {
if (tab_strip_region_view_->IsPositionInWindowCaption(test_point))
return HTCAPTION;
return HTCLIENT;
}
// The top few pixels of the TabStrip are a drop-shadow - as we're pretty
// starved of dragable area, let's give it to window dragging (this also
// makes sense visually).
// TODO(tluk): Investigate the impact removing this has on draggable area
// given the tab strip no longer uses shadows.
views::Widget* widget = browser_view_->GetWidget();
if (!(widget->IsMaximized() || widget->IsFullscreen()) &&
(point_in_browser_view_coords.y() <
(tab_strip_region_view_->y() + kTabShadowSize))) {
// We return HTNOWHERE as this is a signal to our containing
// NonClientView that it should figure out what the correct hit-test
// code is given the mouse position...
return HTNOWHERE;
}
}
// For PWAs with window-controls-overlay display override, see if we're in an
// app defined draggable region so we can return htcaption.
web_app::AppBrowserController* controller =
browser_view_->browser()->app_controller();
if (controller && controller->IsWindowControlsOverlayEnabled() &&
controller->draggable_region().has_value() &&
controller->draggable_region()->contains(point.x(), point.y())) {
return HTCAPTION;
}
// If the point's y coordinate is below the top of the topmost view and
// otherwise within the bounds of this view, the point is considered to be
// within the client area.
gfx::Rect bounds_from_toolbar_top = browser_view_->bounds();
bounds_from_toolbar_top.Inset(0, GetClientAreaTop(), 0, 0);
if (bounds_from_toolbar_top.Contains(point))
return HTCLIENT;
// If the point's y coordinate is above the top of the toolbar, but not
// over the tabstrip (per previous checking in this function), then we
// consider it in the window caption (e.g. the area to the right of the
// tabstrip underneath the window controls). However, note that we DO NOT
// return HTCAPTION here, because when the window is maximized the window
// controls will fall into this space (since the BrowserView is sized to
// entire size of the window at that point), and the HTCAPTION value will
// cause the window controls not to work. So we return HTNOWHERE so that the
// caller will hit-test the window controls before finally falling back to
// HTCAPTION.
gfx::Rect tabstrip_background_bounds = browser_view_->bounds();
gfx::Point toolbar_origin = toolbar_->origin();
views::View::ConvertPointToTarget(top_container_, browser_view_,
&toolbar_origin);
tabstrip_background_bounds.set_height(toolbar_origin.y());
if (tabstrip_background_bounds.Contains(point))
return HTNOWHERE;
// If the point is somewhere else, delegate to the default implementation.
return browser_view_->views::ClientView::NonClientHitTest(point);
}
//////////////////////////////////////////////////////////////////////////////
// BrowserViewLayout, views::LayoutManager implementation:
void BrowserViewLayout::Layout(views::View* browser_view) {
TRACE_EVENT0("ui", "BrowserViewLayout::Layout");
vertical_layout_rect_ = browser_view->GetLocalBounds();
int top_inset = delegate_->GetTopInsetInBrowserView();
int top = LayoutTabStripRegion(top_inset);
if (delegate_->IsTabStripVisible()) {
tab_strip_->SetBackgroundOffset(tab_strip_region_view_->GetMirroredX() +
browser_view_->GetMirroredX() +
delegate_->GetThemeBackgroundXInset());
}
top = LayoutWebUITabStrip(top);
top = LayoutToolbar(top);
top = LayoutBookmarkAndInfoBars(top, browser_view->y());
// Top container requires updated toolbar and bookmark bar to compute bounds.
UpdateTopContainerBounds();
// Layout items at the bottom of the view.
int bottom = LayoutWebFooterExperiment(browser_view->height());
bottom = LayoutDownloadShelf(bottom);
// Layout the contents container in the remaining space.
LayoutContentsContainerView(top, bottom);
if (contents_border_widget_ && contents_border_widget_->IsVisible()) {
gfx::Point contents_top_left;
views::View::ConvertPointToScreen(contents_container_, &contents_top_left);
contents_border_widget_->SetBounds(
gfx::Rect(contents_top_left.x(), contents_top_left.y(),
contents_container_->width(), contents_container_->height()));
}
// This must be done _after_ we lay out the WebContents since this
// code calls back into us to find the bounding box the find bar
// must be laid out within, and that code depends on the
// TabContentsContainer's bounds being up to date.
//
// Because Find Bar can be repositioned to keep from hiding find results, we
// don't want to reset its position on every layout, however - only if the
// geometry of the contents pane actually changes in a way that could affect
// the positioning of the bar.
const gfx::Rect new_contents_bounds =
contents_container_->GetBoundsInScreen();
if (delegate_->HasFindBarController() &&
(new_contents_bounds.width() != latest_contents_bounds_.width() ||
(new_contents_bounds.y() != latest_contents_bounds_.y() &&
new_contents_bounds.height() != latest_contents_bounds_.height()))) {
delegate_->MoveWindowForFindBarIfNecessary();
}
latest_contents_bounds_ = new_contents_bounds;
// Adjust the fullscreen exit bubble bounds for |top_container_|'s new bounds.
// This makes the fullscreen exit bubble look like it animates with
// |top_container_| in immersive fullscreen.
ExclusiveAccessBubbleViews* exclusive_access_bubble =
delegate_->GetExclusiveAccessBubble();
if (exclusive_access_bubble)
exclusive_access_bubble->RepositionIfVisible();
// Adjust any hosted dialogs if the browser's dialog hosting bounds changed.
const gfx::Rect dialog_bounds(dialog_host_->GetDialogPosition(gfx::Size()),
dialog_host_->GetMaximumDialogSize());
if (latest_dialog_bounds_ != dialog_bounds) {
latest_dialog_bounds_ = dialog_bounds;
dialog_host_->NotifyPositionRequiresUpdate();
}
}
// Return the preferred size which is the size required to give each
// children their respective preferred size.
gfx::Size BrowserViewLayout::GetPreferredSize(const views::View* host) const {
return gfx::Size();
}
//////////////////////////////////////////////////////////////////////////////
// BrowserViewLayout, private:
int BrowserViewLayout::LayoutTabStripRegion(int top) {
TRACE_EVENT0("ui", "BrowserViewLayout::LayoutTabStripRegion");
if (!delegate_->IsTabStripVisible()) {
SetViewVisibility(tab_strip_region_view_, false);
tab_strip_region_view_->SetBounds(0, 0, 0, 0);
return top;
}
// This retrieves the bounds for the tab strip based on whether or not we show
// anything to the left of it, like the incognito avatar.
gfx::Rect tab_strip_region_bounds(
delegate_->GetBoundsForTabStripRegionInBrowserView());
SetViewVisibility(tab_strip_region_view_, true);
tab_strip_region_view_->SetBoundsRect(tab_strip_region_bounds);
return tab_strip_region_bounds.bottom() -
GetLayoutConstant(TABSTRIP_TOOLBAR_OVERLAP);
}
int BrowserViewLayout::LayoutWebUITabStrip(int top) {
TRACE_EVENT0("ui", "BrowserViewLayout::LayoutWebUITabStrip");
if (!webui_tab_strip_)
return top;
if (!webui_tab_strip_->GetVisible()) {
webui_tab_strip_->SetBoundsRect(gfx::Rect());
return top;
}
webui_tab_strip_->SetBounds(
vertical_layout_rect_.x(), top, vertical_layout_rect_.width(),
webui_tab_strip_->GetHeightForWidth(vertical_layout_rect_.width()));
return webui_tab_strip_->bounds().bottom();
}
int BrowserViewLayout::LayoutToolbar(int top) {
TRACE_EVENT0("ui", "BrowserViewLayout::LayoutToolbar");
int browser_view_width = vertical_layout_rect_.width();
bool toolbar_visible = delegate_->IsToolbarVisible();
int height = toolbar_visible ? toolbar_->GetPreferredSize().height() : 0;
SetViewVisibility(toolbar_, toolbar_visible);
toolbar_->SetBounds(vertical_layout_rect_.x(), top, browser_view_width,
height);
return toolbar_->bounds().bottom();
}
int BrowserViewLayout::LayoutBookmarkAndInfoBars(int top, int browser_view_y) {
TRACE_EVENT0("ui", "BrowserViewLayout::LayoutBookmarkAndInfoBars");
web_contents_modal_dialog_top_y_ =
top + browser_view_y - kConstrainedWindowOverlap;
if (bookmark_bar_) {
top = std::max(toolbar_->bounds().bottom(), LayoutBookmarkBar(top));
}
if (delegate_->IsContentsSeparatorEnabled() &&
(toolbar_->GetVisible() || bookmark_bar_) && top > 0) {
SetViewVisibility(contents_separator_, true);
const int separator_height =
contents_separator_->GetPreferredSize().height();
contents_separator_->SetBounds(vertical_layout_rect_.x(), top,
vertical_layout_rect_.width(),
separator_height);
if (loading_bar_) {
SetViewVisibility(loading_bar_, true);
loading_bar_->SetBounds(vertical_layout_rect_.x(), top - 2,
vertical_layout_rect_.width(),
separator_height + 2);
top_container_->ReorderChildView(loading_bar_, -1);
}
top += separator_height;
} else {
SetViewVisibility(contents_separator_, false);
if (loading_bar_)
SetViewVisibility(loading_bar_, false);
}
return LayoutInfoBar(top);
}
int BrowserViewLayout::LayoutBookmarkBar(int top) {
if (!delegate_->IsBookmarkBarVisible()) {
SetViewVisibility(bookmark_bar_, false);
// TODO(jamescook): Don't change the bookmark bar height when it is
// invisible, so we can use its height for layout even in that state.
bookmark_bar_->SetBounds(0, top, browser_view_->width(), 0);
return top;
}
bookmark_bar_->SetInfoBarVisible(IsInfobarVisible());
int bookmark_bar_height = bookmark_bar_->GetPreferredSize().height();
bookmark_bar_->SetBounds(vertical_layout_rect_.x(), top,
vertical_layout_rect_.width(), bookmark_bar_height);
// Set visibility after setting bounds, as the visibility update uses the
// bounds to determine if the mouse is hovering over a button.
SetViewVisibility(bookmark_bar_, true);
return top + bookmark_bar_height;
}
int BrowserViewLayout::LayoutInfoBar(int top) {
// In immersive fullscreen or when top-chrome is fully hidden due to the page
// gesture scroll slide behavior, the infobar always starts near the top of
// the screen.
if (immersive_mode_controller_->IsEnabled() ||
(delegate_->IsTopControlsSlideBehaviorEnabled() &&
delegate_->GetTopControlsSlideBehaviorShownRatio() == 0.f)) {
// Can be null in tests.
top = browser_view_ ? browser_view_->y() : 0;
}
SetViewVisibility(infobar_container_, IsInfobarVisible());
infobar_container_->SetBounds(
vertical_layout_rect_.x(), top, vertical_layout_rect_.width(),
infobar_container_->GetPreferredSize().height());
return top + infobar_container_->height();
}
void BrowserViewLayout::LayoutContentsContainerView(int top, int bottom) {
TRACE_EVENT0("ui", "BrowserViewLayout::LayoutContentsContainerView");
// |contents_container_| contains web page contents and devtools.
// See browser_view.h for details.
gfx::Rect contents_container_bounds(vertical_layout_rect_.x(),
top,
vertical_layout_rect_.width(),
std::max(0, bottom - top));
if (webui_tab_strip_ && webui_tab_strip_->GetVisible()) {
// The WebUI tab strip container should "push" the tab contents down without
// resizing it.
contents_container_bounds.Inset(0, 0, 0,
-webui_tab_strip_->size().height());
}
if (side_panel_ && side_panel_->GetVisible()) {
// Side panel occupies some of the container's space.
gfx::Rect side_panel_bounds = contents_container_bounds;
side_panel_bounds.set_width(side_panel_->GetPreferredSize().width());
// Shrink container bounds to fit the side panel.
contents_container_bounds.set_width(contents_container_bounds.width() -
side_panel_bounds.width());
// Place the side panel to the right of contents.
side_panel_bounds.set_x(contents_container_bounds.x() +
contents_container_bounds.width());
gfx::Rect separator_bounds = contents_separator_->bounds();
const int separator_height = separator_bounds.height();
// Raise the side panel bounds with the height of the separator to have it
// connected to the toolbar area (and not be spoofable by web content).
side_panel_bounds.set_y(side_panel_bounds.y() - separator_height);
side_panel_bounds.set_height(side_panel_bounds.height() + separator_height);
side_panel_->SetBoundsRect(side_panel_bounds);
// Resize separator so that it separates the contents area only.
separator_bounds.set_width(contents_container_bounds.width() + 1);
contents_separator_->SetBoundsRect(separator_bounds);
}
contents_container_->SetBoundsRect(contents_container_bounds);
}
void BrowserViewLayout::UpdateTopContainerBounds() {
// Set the bounds of the top container view such that it is tall enough to
// fully show all of its children. In particular, the bottom of the bookmark
// bar can be above the bottom of the toolbar while the bookmark bar is
// animating. The top container view is positioned relative to the top of the
// client view instead of relative to GetTopInsetInBrowserView() because the
// top container view paints parts of the frame (title, window controls)
// during an immersive fullscreen reveal.
int height = 0;
for (views::View* child : top_container_->children()) {
if (child->GetVisible())
height = std::max(height, child->bounds().bottom());
}
// Ensure that the top container view reaches the topmost view in the
// ClientView because the bounds of the top container view are used in
// layout and we assume that this is the case.
height = std::max(height, delegate_->GetTopInsetInBrowserView());
gfx::Rect top_container_bounds(vertical_layout_rect_.width(), height);
if (delegate_->IsTopControlsSlideBehaviorEnabled()) {
// If the top controls are fully hidden, then it's positioned outside the
// views' bounds.
const float ratio = delegate_->GetTopControlsSlideBehaviorShownRatio();
top_container_bounds.set_y(ratio == 0 ? -height : 0);
} else {
// If the immersive mode controller is animating the top container, it may
// be partly offscreen.
top_container_bounds.set_y(
immersive_mode_controller_->GetTopContainerVerticalOffset(
top_container_bounds.size()));
}
top_container_->SetBoundsRect(top_container_bounds);
}
int BrowserViewLayout::LayoutDownloadShelf(int bottom) {
TRACE_EVENT0("ui", "BrowserViewLayout::LayoutDownloadShelf");
if (download_shelf_ && download_shelf_->GetVisible()) {
const int height = download_shelf_->GetPreferredSize().height();
download_shelf_->SetBounds(vertical_layout_rect_.x(), bottom - height,
vertical_layout_rect_.width(), height);
bottom -= height;
}
return bottom;
}
int BrowserViewLayout::GetClientAreaTop() {
// If webui_tab_strip is displayed, the client area starts at its top,
// otherwise at the top of the toolbar.
return webui_tab_strip_ && webui_tab_strip_->GetVisible()
? webui_tab_strip_->y()
: toolbar_->y();
}
int BrowserViewLayout::LayoutWebFooterExperiment(int bottom) {
if (!web_footer_experiment_)
return bottom;
bottom -= 1;
web_footer_experiment_->SetBounds(vertical_layout_rect_.x(), bottom,
vertical_layout_rect_.width(), 1);
return bottom;
}
bool BrowserViewLayout::IsInfobarVisible() const {
// NOTE: Can't check if the size IsEmpty() since it's always 0-width.
return infobar_container_->GetPreferredSize().height() != 0;
}