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* commit '6d1387b6ecf0aaea6f36472fcd1a499824fd30b5':
  SDK docs: Hierarchy Viewer V2
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Joe Malin
2011-02-15 12:34:35 -08:00
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@@ -7,162 +7,498 @@ page.title=Debugging and Profiling User Interfaces
<ol>
<li>
<a href="#hierarchyViewer">Debugging and Optimizing User Interfaces with Hierarchy
Viewer</a>
<ol>
<li><a href="#layoutview">Layout View</a></li>
<li><a href="#pixelperfect">Pixel Perfect View</a></li>
</ol>
<a href="#HierarchyViewer">
Debugging and Optimizing User Interfaces with Hierarchy Viewer
</a>
<ol>
<li><a href="#runhv">Running Hierarchy Viewer and choosing a window</a></li>
<li><a href="#viewhierarchy">About the View Hierarchy window</a></li>
<li><a href="#indiView">Working with an individual View in Tree View</a></li>
<li><a href="#hvdebugging">Debugging with View Hierarchy</a></li>
<li><a href="#hvoptimize">Optimizing with View Hierarchy</a></li>
</ol>
</li>
<li>
<a href="#pixelperfect">
Examining and Designing User Interfaces with Pixel Perfect
</a>
<ol>
<li><a href="#aboutpixelperfect">About the Pixel Perfect window</a></li>
<li><a href="#overlays">Working with Pixel Perfect overlays</a></li>
</ol>
</li>
<li><a href="#layoutopt">Optimizing Layouts with <code>layoutopt</code></a></li>
</ol>
</div>
</div>
<p>Sometimes your application's layout can slow down your application.
To help debug issues in your layout, the Android SDK provides the Hierarchy Viewer and
<p>Sometimes your application's layout can slow down your application.
To help debug issues in your layout, the Android SDK provides the Hierarchy Viewer and
<code>layoutopt</code> tools.
</p>
<p>The Hierarchy Viewer application allows you to debug and optimize your user interface. It
provides a visual representation of the layout's View hierarchy (the Layout View) and a magnified
inspector of the display (the Pixel Perfect View).</p>
provides a visual representation of the layout's View hierarchy (the View Hierarchy window)
and a magnified view of the display (the Pixel Perfect window).</p>
<p><code>layoutopt</code> is a command-line tool that helps you optimize the layouts and layout
hierarchies of your applications. You can run it against your layout files or resource
directories to quickly check for inefficiencies or other types of problems that could be
affecting the performance of your application.</p>
<h2 id="hierarchyViewer">Debugging and Optimizing User Interfaces with Hierarchy Viewer</h2>
<h2 id="HierarchyViewer">Debugging and Optimizing User Interfaces with Hierarchy Viewer</h2>
<p>To get the Hierarchy Viewer started:</p>
<ol>
<li>Connect your device or launch an emulator.</li>
<li>From a terminal, launch <code>hierarchyviewer</code> from the <code>&lt;sdk&gt;/tools/</code>
directory.</li>
<li>In the window that opens, you'll see a list of <strong>Devices</strong>. When a device is
selected, a list of currently active <strong>Windows</strong> is displayed on the right. The
<em>&lt;Focused Window&gt;</em> is the window currently in the foreground, and also the default
window loaded if you do not select another.</li>
<li>Select the window that you'd like to inspect and click <strong>Load View
Hierarchy</strong>. The Layout View will be loaded. You can then load the Pixel Perfect View by
clicking the second icon at the bottom-left of the window.</li>
</ol>
<p>If you've navigated to a different window on the device, press <strong>Refresh
Windows</strong> to refresh the list of available windows on the right.</p>
<h3 id="layoutview">Layout View</h3>
<p>The Layout View offers a look at the View layout and properties. It has three views:</p>
<ul>
<li>Tree View: a hierarchy diagram of the Views, on the left.</li>
<li>Properties View: a list of the selected View's properties, on the top-right.</li>
<li>Wire-frame View: a wire-frame drawing of the layout, on the bottom-right.</li>
</ul><br />
<img src="{@docRoot}images/hierarchyviewer-layout.png"
<h3 id="runhv">Running Hierarchy Viewer and choosing a window</h3>
<p>
To run Hierarchy Viewer, follow these steps:</p>
<ol>
<li>
Connect your device or launch an emulator.
<p>
To preserve security, Hierarchy Viewer can only connect to devices running a
developer version of the Android system.
</p>
</li>
<li>
If you have not done so already, install the application you want to work with.
</li>
<li>
Run the application, and ensure that its UI is visible.
</li>
<li>
From a terminal, launch <code>hierarchyviewer</code> from the
<code>&lt;sdk&gt;/tools/</code>
directory.
</li>
<li>
The first window you see displays a list of devices and emulators. To expand the list
of Activity objects for a device or emulator, click the arrow on the left. This displays a
list of the Activity objects whose UI is currently visible on the device or emulator. The
objects are listed by their Android component name. The list includes both your application
Activity and system Activity objects. A screenshot of this window appears in
figure 1.
</li>
<li>
Select the name of your Activity from the list. You can now look at its view
hierarchy using the View Hierarchy window, or look at a magnified image of the UI using
the Pixel Perfect window.
</li>
</ol>
<p>
To learn how to use the View Hierarchy window, go to
<a href="#viewhierarchy">About the View Hierarchy window</a>. To learn how to use the
Pixel Perfect window, go to <a href="#pixelperfect">About the Pixel Perfect window</a>.
</p>
<img id="Fig1" src="{@docRoot}images/developing/hv_device_window.png" alt="" height="600"/>
<p class="img-caption"><strong>Figure 1.</strong> Hierarchy Viewer device window</p>
<h3 id="viewhierarchy">About the View Hierarchy window</h3>
<p>
The View Hierarchy window displays the View objects that form the UI of the
Activity that is running on your device or emulator. You use it to look at individual
View objects within the context of the entire View tree. For each View object, the View
Hierarchy window also displays rendering performance data.
</p>
<p>
To see the View Hierarchy window, run Hierarchy Viewer as described in
the section <a href="#runhv">Running Hierarchy Viewer and choosing a window</a>. Next, click
<strong>View Hierarchy</strong> at the top of the device window.
</p>
<p>
You should see four panes:
</p>
<ul>
<li>
<strong>Tree View</strong>: The left-hand pane displays the Tree View,
a diagram of the Activity object's hierarchy of views. Use Tree View to examine individual
View objects and see the relationships between View objects in your UI.
<p>
To zoom in on the pane, use the slider at the bottom of the pane, or use your mouse
scroll wheel. To move around in the pane or reveal View objects that are not currently
visible, click and drag the pane.
</p>
<p>
To highlight the nodes in the tree whose class or ID match a search string, enter the
string in the <strong>Filter by class or id:</strong> edit box at the bottom of the
window. The background of nodes that match the search string will change from gray to
bright blue.
</p>
<p>
To save a screenshot of Tree View to a PNG file, click <strong>Save As PNG</strong> at
the top of the View Hierarchy window. This displays a dialog in which you can choose
a directory and file name.
</p>
<p>
To save a layered screenshot of your device or emulator to an Adobe Photoshop (PSD)
file, click <strong>Capture Layers</strong> at the top of the View Hierarchy window.
This displays a dialog in which you can choose a directory or file name.
Each View in the UI is saved as a separate Photoshop layer.
</p>
<p>
In Photoshop (or similar program that accepts .psd files), you can hide, show or edit a
layer independently of others. When you save a layered screenshot, you can examine and
modify the image of an individual View object. This helps you experiment with design
changes.
</p>
</li>
<li>
The upper right-hand pane displays the <strong>Tree Overview</strong>, a smaller map
representation of the entire Tree View window. Use Tree Overview to identify the part of the
view tree that is being displayed in Tree View.
<p>
You can also use Tree Overview to move around in the Tree View pane. Click and drag
the shaded rectangle over an area to reveal it in Tree View.
</p>
</li>
<li>
The middle right-hand pane displays the <strong>Properties View</strong>,
a list of the properties for a selected View object. With Properties View, you can
examine all the properties without having to look at your application source.
<p>
The properties are organized by category. To find an individual property, expand
a category name by clicking the arrow on its left. This reveals all the properties
in that category.
</p>
</li>
<li>
The lower right-hand pane displays the <strong>Layout View</strong>,
a block representation of the UI. Layout View is another way to navigate through your UI.
When you click on a View object in Tree View, its position in the UI is highlighted.
Conversely, when you click in an area of Layout View, the View object for that area is
highlighted in Tree View.
<p>
The outline colors of blocks in Layout View provide additional information:
</p>
<ul>
<li>
Bold red: The block represents the the View that is currently selected in
Tree View.
</li>
<li>
Light red: The block represents the parent of the block outlined in bold red.
</li>
<li>
White: The block represents a visible View that is not a parent or child of the
View that is currently selected in Tree View.
</li>
</ul>
</li>
</ul>
<p>
When the UI of the current Activity changes, the View Hierarchy window is not automatically
updated. To update it, click <strong>Load View Hierarchy</strong> at the top of the window.
</p>
<p>
Also, the window is not updated if you switch to a new Activity. To update it, start by
clicking the window selection icon in the bottom left-hand corner of the window. This
navigates back to the Window Selection window. From this window, click the Android
component name of the new Activity and then click <strong>Load View Hierarchy</strong>
at the top of the window.
</p>
<p>
A screenshot of the View Hierarchy window appears in figure 2.
</p>
<img id="Fig2" src="{@docRoot}images/developing/hv_view_hierarchy_window.png" alt="" height="600"/>
<p class="img-caption"><strong>Figure 2.</strong> The View Hierarchy window</p>
<h3 id="indiView">Working with an individual View in Tree View</h3>
<p>
Each node in Tree View represents a single View. Some information is always visible. Starting
at the top of the node, you see the following:
</p>
<ol>
<li>
View class: The View object's class.
</li>
<li>
View object address: A pointer to View object.
</li>
<li>
View object ID: The value of the
<code><a href="{@docRoot}guide/topics/resources/layout-resource.html#idvalue">android:id</a>
</code> attribute.
</li>
<li>
Performance indicators: A set of three colored dots that indicate the rendering
speed of this View relative to other View objects in the tree. The three dots
represent (from left to right) the measure, layout, and draw times of the rendering.
<p>
The colors indicate the following relative performance:
</p>
<ul>
<li>
Green: For this part of the render time, this View is in the faster 50% of all
the View objects in the tree. For example, a green dot for the measure time means
that this View has a faster measure time than 50% of the View objects in the tree.
</li>
<li>
Yellow: For this part of the render time, this View is in the slower 50% of all
the View objects in the tree. For example, a yellow dot for the layout time means
that this View has a slower layout time than 50% of the View objects in the tree.
</li>
<li>
Red: For this part of the render time, this View is the slowest one in the tree.
For example, a red dot for the draw time means that this View takes the most
time to draw of all the View objects in the tree.
</li>
</ul>
</li>
<li>
View index: The zero-based index of the View in its parent View. If it is the only child,
this is 0.
</li>
</ol>
<p>
When you select a node, additional information for the View appears in a small window above
the node. When you click one of the nodes, you see the following:
</p>
<ul>
<li>
Image: The actual image of the View, as it would appear in the emulator. If the View has
children, these are also displayed.
</li>
<li>
View count: The number of View objects represented by this node. This includes the View
itself and a count of its children. For example, this value is 4 for a View that has 3
children.
</li>
<li>
Render times: The actual measure, layout, and draw times for the View rendering, in
milliseconds. These represent the same values as the performance indicators mentioned in
the preceding section.
</li>
</ul>
<p>
An annotated screenshot of an individual node in the Tree View window appears in figure 3.
</p>
<img id="Fig3" src="{@docRoot}images/developing/hv_treeview_screenshot.png" alt="" height="600"/>
<p class="img-caption"><strong>Figure 3.</strong> An annotated node in Tree View</p>
<h3 id="hvdebugging">Debugging with View Hierarchy</h3>
<p>
The View Hierarchy window helps you debug an application by providing a static display
of the UI. The display starts with your application's opening screen. As you step through
your application, the display remains unchanged until you redraw it by invalidating and
then requesting layout for a View.
</p>
<p>
To redraw a View in the display:
</p>
<ul>
<li>
Select a View in Tree View. As you move up towards the root of the tree (to the
left in the Tree View), you see the highest-level View objects. Redrawing a high-level
object usually forces the lower-level objects to redraw as well.
</li>
<li>
Click <strong>Invalidate</strong> at the top of the window. This marks the View as
invalid, and schedules it for a redraw at the next point that a layout is requested.
</li>
<li>
Click <strong>Request Layout</strong> to request a layout. The View and its children
are redrawn, as well as any other View objects that need to be redrawn.
</li>
</ul>
<p>
Manually redrawing a View allows you to watch the View object tree and examine the properties of
individual View objects one step at a time as you go through breakpoints in your code.
</p>
<h3 id="hvoptimize">Optimizing with View Hierarchy</h3>
<p>
View Hierarchy also helps you identify slow render performance. You start by looking at the
View nodes with red or yellow performance indicators to identify the slower View objects. As you
step through your application, you can judge if a View is consistently slow or slow only in
certain circumstances.
</p>
<p>
Remember that slow performance is not necessarily evidence of a problem, especially for
ViewGroup objects. View objects that have more children and more complex View objects render
more slowly.
</p>
<p>
The View Hierarchy window also helps you find performance issues. Just by looking at the
performance indicators (the dots) for each View node, you can see which View objects are the
slowest to measure, layout, and draw. From that, you can quickly identify the problems you
should look at first.
</p>
<h2 id="pixelperfect">Examining and Designing User Interfaces with Pixel Perfect</h2>
<p>
Pixel Perfect is a tool for examining pixel properties and laying out UIs from a design drawing.
</p>
<h3 id="aboutpixelperfect">About the Pixel Perfect window</h3>
<p>
The Pixel Perfect window displays a magnified image of the screen that is currently
visible on the emulator or device. In it, you can examine the properties
of individual pixels in the screen image. You can also use the Pixel Perfect window
to help you lay out your application UI based on a bitmap design.
</p>
<p>
To see the Pixel Perfect window, run Hierarchy Viewer, as described in
the section <a href="#runhv">Running Hierarchy Viewer and choosing a window</a>. Next, click
<strong>Inspect Screenshot</strong> at the top of the device window. The Pixel Perfect window
appears.
</p>
<p>
In it, you see three panes:
</p>
<ul>
<li>
View Object pane: This is a hierarchical list of the View objects that are currently
visible on the device or emulator screen, including both the ones in your application and
the ones generated by the system. The objects are listed by their View class.
To see the class names of a View object's children, expand the View by clicking the
arrow to its left. When you click a View, its position is highlighted in the Pixel Perfect
pane on the right.
</li>
<li>
Pixel Perfect Loupe pane: This is the magnified screen image. It is overlaid by a grid in
which each square represents one pixel. To look at the information for a pixel, click in its
square. Its color and X,Y coordinates appear at the bottom of the pane.
<p>
The magenta crosshair in the pane corresponds to the positioning
crosshair in the next pane. It only moves when you move the crosshair in the next pane.
</p>
<p>
To zoom in or out on the image, use the <strong>Zoom</strong> slider at the bottom of
the pane, or use your mouse's scroll wheel.
</p>
<p>
When you select a pixel in the Loupe pane, you see the following information at the
bottom of the pane:
</p>
<ul>
<li>
Pixel swatch: A rectangle filled with the same color as the pixel.
</li>
<li>
HTML color code: The hexadecimal RGB code corresponding to the pixel color
</li>
<li>
RGB color values: A list of the (R), green (G), and blue (B) color values of the
pixel color. Each value is in the range 0-255.
</li>
<li>
X and Y coordinates: The pixel's coordinates, in device-specific pixel units.
The values are 0-based, with X=0 at the left of the screen and Y=0 at the top.
</li>
</ul>
</li>
<li>
Pixel Perfect pane: This displays the currently visible screen as it would appear in the
emulator.
<p>
You use the cyan crosshair to do coarse positioning. Drag the crosshair in the image,
and the Loupe crosshair will move accordingly. You can also click on a point in the
Pixel Perfect pane, and the crosshair will move to that point.
</p>
<p>
The image corresponding to the View object selected in the View Object pane is
outlined in a box that indicates the View object's position on the screen. For the
selected object, the box is bold red. Sibling and parent View objects have a light
red box. View objects that are neither parents nor siblings are in white.
</p>
<p>
The layout box may have other rectangles either inside or outside it, each of which
indicates part of the View. A purple or green rectangle indicates the View bounding box.
A white or black box inside the layout box represents the <strong>padding</strong>, the
defined distance between the View object's content and its bounding box. An outer white
or black rectangle represents the <strong>margins</strong>, the distance between the
View bounding box and adjacent View objects. The padding and margin boxes are white if
the layout background is black, and vice versa.
</p>
<p>
You can save the screen image being displayed in the Pixel Perfect pane as a PNG file.
This produces a screenshot of the current screen. To do this, click
<strong>Save as PNG</strong> at the top of the window. This displays a dialog,
in which you can choose a directory and filename for the file.
</p>
</li>
</ul>
<p>
The panes are not automatically refreshed when you change one of the View objects or go to
another Activity. To refresh the Pixel Perfect pane and the Loupe pane, click
<strong>Refresh Screenshot</strong> at the top of the window. This will change the panes
to reflect the current screen image. You still may need to refresh the View Object pane;
to do this, click <strong>Refresh Tree</strong> at the top of the window.
</p>
<p>
To automatically refresh the panes while you are debugging, set
<strong>Auto Refresh</strong> at the top of the window, and then set a refresh rate
with the <strong>Refresh Rate</strong> slider at the bottom of the Loupe pane.
</p>
<h3 id="overlays">Working with Pixel Perfect overlays</h3>
<p>
You often construct a UI based on a design done as a bitmap image. The Pixel Perfect window
helps you match up your View layout to a bitmap image by allowing you to load the bitmap as an
<strong>overlay</strong> on the screen image.
</p>
<p>
To use a bitmap image as an overlay:
</p>
<ul>
<li>
Start your application in a device or emulator and navigate to the Activity whose UI you
want to work with.
</li>
<li>
Start Hierarchy Viewer and navigate to the Pixel Perfect window.
</li>
<li>
At the top of the window, click <strong>Load Overlay</strong>. A dialog opens, prompting
for the image file to load. Load the image file.
</li>
<li>
Pixel Perfect displays the overlay over the screen image in the Pixel Perfect pane. The
lower left corner of the bitmap image (X=0, Y=<em>max value</em>) is anchored on the lower
leftmost pixel (X=0, Y=<em>max screen</em>) of the screen.
<p>
By default, the overlay has a 50% transparency, which allows you to see the screen
image underneath. You can adjust this with the <strong>Overlay:</strong> slider at the
bottom of the Loupe pane.
</p>
<p>
Also by default, the overlay is not displayed in the Loupe pane. To display it,
set <strong>Show in Loupe</strong> at the top of the window.
</p>
</li>
</ul>
<p>
The overlay is not saved as part of the screenshot when you save the screen image as a PNG
file.
</p>
<p>
A screenshot of the Pixel Perfect window appears in figure 4.
</p>
<img id="Fig4" src="{@docRoot}images/developing/hv_pixelperfect.png"
alt=""
height="509"
width="700" />
<p class="img-caption"><strong>Figure 1.</strong> Screenshot of Hierarchy Viewer</p>
height="600"/>
<p class="img-caption"><strong>Figure 4.</strong> The Pixel Perfect window</p>
<h2 id="layoutopt">Optimizing layouts with layoutopt</h2>
<p>
The <code>layoutopt</code> tool lets you analyze the XML files that define your
application's UI to find inefficiencies in the view hierarchy.</p>
<p>Select a node in the Tree View to display the properties of that element in the Properties
View. When a node is selected, the Wire-frame View also indicates the bounds of the element with
a red rectangle. Double click a node in the tree (or select it, and click <strong>Display
View</strong>) to open a new window with a rendering of that element.</p>
<p>The Layout View includes a couple other helpful features for debugging your layout:
<strong>Invalidate</strong> and <strong>Request Layout</strong>. These buttons execute the
respective View calls, {@link android.view.View#invalidate()} and {@link
android.view.View#requestLayout()}, on the View element currently selected in the tree. Calling
these methods on any View can be very useful when simultaneously running a debugger on your
application.</p>
<p>The Tree View can be resized by adjusting the zoom slider, below the diagram. The number of
View elements in the window is also given here. You should look for ways to minimize the number
of Views. The fewer View elements there are in a window, the faster it will perform.</p>
<p>If you interact with the device and change the focused View, the diagram will not
automatically refresh. You must reload the Layout View by clicking <strong>Load View
Hierarchy</strong>.</p>
<h3 id="pixelperfect">Pixel Perfect View</h3>
<p>The Pixel Perfect View provides a magnified look at the current device window. It helps you
design your UI better by giving you a closer look at your UI's image quality, alignment, and other
aesthetic qualities. It has three views:</p>
<ul>
<li>Explorer View: shows the View hierarchy as a list, on the left.</li>
<li>Normal View: a normal view of the device window, in the middle.</li>
<li>Loupe View: a magnified, pixel-grid view of the device window, on the right.</li>
</ul><br />
<img src="{@docRoot}images/hierarchyviewer-pixelperfect.png"
alt=""
height="509"
width="700" />
<p>Click on an element in the Explorer View and a "layout box" will be drawn in the Normal View
to indicate the layout position of that element. The layout box uses multiple rectangles, to
indicate the normal bounds, the padding and the margin (as needed). The purple or green rectangle
indicates the normal bounds of the element (the height and width). The inner white or black
rectangle indicates the content bounds, when padding is present. A black or white rectangle
outside the normal purple/green rectangle indicates any present margins. (There are two colors
for each rectangle, in order to provide the best contrast based on the colors currently in the
background.)</p>
<p>A very handy feature for designing your UI is the ability to overlay an image in the Normal
and Loupe Views. For example, you might have a mock-up image of how you'd like to layout your
interface. By selecting <strong>Load...</strong> from the controls in the Normal View, you can
choose the image from your computer and it will be placed atop the preview. Your chosen image
will anchor at the bottom left corner of the screen. You can then adjust the opacity of the
overlay and begin fine-tuning your layout to match the mock-up.</p>
<p>The Normal View and Loupe View refresh at regular intervals (5 seconds by default), but the
Explorer View does not. If you navigate away and focus on a different View, then you should
refresh the Explorer's hierarchy by clicking <strong>Load View Hierarchy</strong>. This is even
true when you're working in a window that holds multiple Views that are not always visible. If
you do not, although the previews will refresh, clicking a View in the Explorer will not provide
the proper layout box in the Normal View, because the hierarchy believes you are still focused on
the prior View.</p>
<p>Optional controls include:</p>
<ul>
<li><strong>Overlay</strong>: Load an overlay image onto the view and adjust its opacity.</li>
<li><strong>Refresh Rate</strong>: Adjust how often the Normal and Loupe View refresh their
display.</li>
<li><strong>Zoom</strong>: Adjust the zoom level of the Loupe View.</li>
</ul>
<h2 id="layoutopt">Optimizing layouts with layoutopt</h2>
<p>The <code>layoutopt</code> tool lets you analyze the XML files that represent your application's layout
and finds ineffiencies in the view hierarchy.</p>
<p>To run the tool, open a terminal and launch <code>layoutopt &lt;resources&gt;</code> from your
SDK <code>tools/</code> directory. In the command, supply a list of uncompiled resource xml files
or directories that you want to analyze.</p>
<p>When run, the tool loads the specified XML files and analyzes their layout structures and
hierarchies according to a set of predefined rules. If it detects issues, it outputs information
about the issues, giving filename, line numbers, description of issue, and for some types of
issues a suggested resolution.</p>
<p>Here's an example of the output:</p>
<pre>
<p>
To run the tool, open a terminal and launch <code>layoutopt &lt;xmlfiles&gt;</code>
from your SDK <code>tools/</code> directory. The &lt;xmlfiles&gt; argument is a space-
delimited list of resources you want to analyze, either uncompiled resource xml files or
directories of such files.
</p>
<p>
The tool loads the specified XML files and analyzes their definitions and
hierarchies according to a set of predefined rules. For every issue it detects, it
displays the following information:
</p>
<ul>
<li>
The filename in which the issue was detected.
</li>
<li>
The line number for the issue.
</li>
<li>
A description of the issue, and for some types of issues it also suggests a resolution.
</li>
</ul>
<p>The following is a sample of the output from the tool:</p>
<pre>
$ layoutopt samples/
samples/compound.xml
7:23 The root-level &lt;FrameLayout/&gt; can be replaced with &lt;merge/&gt;
@@ -188,15 +524,3 @@ samples/useless.xml
7:19 The root-level &lt;FrameLayout/&gt; can be replaced with &lt;merge/&gt;
11:17 This LinearLayout layout or its FrameLayout parent is useless
</pre>
<p>
For more information on running the tool, see the
<a href="${@docRoot}guide/developing/debugging/debugging-ui.html#layoutopt">layoutopt</a> reference.</p>

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