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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
/*!
\page quick-images.html
\previouspage quick-text.html
\nextpage quick-user-interaction-methods.html
\title Images
\target basic-image
The Image component is used for adding images to the UI in several supported
formats, including bitmap formats, such as PNG and JPEG, and vector graphics
formats, such as SVG. To use any image files in your designs, you need to
first add them to \l Assets:
\list 1
\li Select \uicontrol Assets
> \inlineimage icons/plus.png
.
\li Select the image file, and then select \uicontrol Open.
\li Select the location where the image will be saved in the
\uicontrol {Add Resources} dialog.
\li Select \uicontrol OK.
\endlist
Your image is now available in \uicontrol Assets.
\image qtquick-designer-image-type.png "Image component in different views"
When you drag-and-drop an image file from \uicontrol Assets to \l Navigator
or \l {Form Editor}, \QC automatically
creates an instance of the Image component for you with the path to the
image file set as the value of the \uicontrol Source field in
\uicontrol Properties.
To load images from a URL using a supported URL scheme, specify the URL
in the \uicontrol Source field.
You can use the \l {Border Image} component to display an image,
such as a PNG file, as a border and a background. For more
information about using border images to create buttons, see
\l {Creating Scalable Buttons and Borders}.
If you need to display animated images, such as GIFs, use the
\l {Animated Image} component.
\section1 Image Size
\image qtquick-designer-image-properties.png "Image properties"
If the image \uicontrol Size is not specified, the size of the source
image is used automatically.
By default, explicitly setting the width and height of the component causes
the image to be scaled to that size. To change this behavior, set the
value of the \uicontrol {Fill mode} field. Images can be stretched, tiled,
or scaled uniformly to the specified size with or without cropping. The
\uicontrol Pad option means that the image is not transformed.
\note If the \uicontrol Clip check box is not selected, the component might
paint outside its bounding rectangle even if the \uicontrol {Fill mode}
is set to \uicontrol PreserveAspectCrop.
Select the \uicontrol Smooth check box to smoothly filter images when scaled
or transformed. Smooth filtering gives better visual quality, but it may be
slower on some hardware. If the image is displayed at its natural size,
this property has no visual or performance effect.
Select the \uicontrol Mipmap check box to use mipmap filtering when scaling
or transforming images. Mipmap filtering gives better visual quality when
scaling down compared with smooth filtering, but it may come at a
performance cost both when initializing the image and during rendering.
Select the \uicontrol {Auto transform} check box if the image should
automatically apply image transformation metadata, such as EXIF orientation.
\section1 Source Size
The \uicontrol {Source size} property specifies the scaled width and height
of the full-frame image. Unlike the value of the \uicontrol Size property,
which scales the painting of the image, this property sets the maximum
number of pixels stored for the loaded image so that large images do not
use more memory than necessary. This ensures the image in memory is no
larger than the set source size, regardless of its set size.
If the image's actual size is larger than the source size, the image is
scaled down. If only one dimension of the size is set to greater than 0,
the other dimension is set in proportion to preserve the source image's
aspect ratio. The \uicontrol {Fill mode} is independent of this.
If both the source size width and height are set, the image is scaled
down to fit within the specified size maintaining the image's aspect ratio.
However, if \uicontrol PreserveAspectCrop or \uicontrol PreserveAspectFit
are used, the image is scaled to match the optimal size for cropping or
fitting.
If the source is an intrinsically scalable image (such as SVG), source size
determines the size of the loaded image regardless of intrinsic size.
Avoid changing the source size property dynamically because rendering an
SVG is slow compared with rendering other image formats.
If the source is a non-scalable image (such as JPEG), the loaded image will
be no greater than the source size specifies. For some formats, the whole
image will never actually be loaded into memory.
\note Changing this property dynamically causes the image source to be
reloaded, potentially even from the network, if it is not in the disk cache.
Select the \uicontrol Cache check box to cache the image.
\section1 Image Alignment
You can align images horizontally and vertically in the
\uicontrol {Alignment H} and \uicontrol {Alignment V}
fields. By default, images are centered.
Select the \uicontrol Mirror check box to horizontally invert the image,
effectively displaying a mirrored image.
\section1 Performance
By default, locally available images are loaded immediately, and the UI
is blocked until loading is complete. If a large image is to be loaded,
it may be preferable to load the image in a low priority thread, by
selecting the \uicontrol Asynchronous check box. If the image is obtained
from a network rather than a local resource, it is automatically loaded
asynchronously.
Images are cached and shared internally, so if several images have the same
\uicontrol Source, only one copy of the image will be loaded.
\note Images are often the greatest user of memory in UIs. We recommended
that you set the \uicontrol {Source size} of images that do not form a part
of the UI. This is especially important for content that is loaded from
external sources or provided by the user.
\section1 Border Image
The Border Image component extends the features of the Image component.
It is used to create borders out of images by scaling or tiling parts
of each image. A source image is broken into 9 regions that are scaled or
tiled individually. The corner regions are not scaled at all, while the
horizontal and vertical regions are scaled according to the values of the
\uicontrol {Tile mode H} and \uicontrol {Tile mode V} field, or both.
The \uicontrol Stretch option scales the image to fit the available area.
The \uicontrol Repeat option tiles the image until there is no more space.
To ensure that the last image is not cropped, select the \uicontrol Round
option that scales the images down when necessary.
Specify the regions of the image in the \uicontrol {Border left},
\uicontrol {Border right}, \uicontrol {Border top}, and
\uicontrol {Border bottom} fields. The regions describe
the distance from each edge of the source image to use as a border.
\image qtquick-designer-border-image-properties.png "Border Image properties"
\note You cannot change the \uicontrol {Source size} of a border image.
For examples of using border images, see the documentation of the
\l [QtQuick]{BorderImage} component.
\section1 Animated Image
The Animated Image component extends the features of the Image component,
providing a way to play animations stored as images containing a series of
frames, such as those stored in GIF files.
Set the speed of the animation in the \uicontrol Speed field. The speed is
measured in percentage of the original animated image speed. The default
speed is 1.0, which means the original speed.
\image qtquick-designer-animated-image-properties.png "Animated Image properties"
To play the animation, select the \uicontrol Playing check box.
To pause the animation, select the \inlineimage icons/pause-icon.png
(\uicontrol Paused) check box.
When the \uicontrol Cache check box is selected, every frame of the
animation is cached. Deselect the check box if you are playing a long
or large animation and you want to conserve memory.
If the image data comes from a sequential device (such as a socket),
Animated Image can only loop if caching is enabled.
For more information, watch the following video:
\youtube DVWd_xMMgvg
\if defined(qtdesignstudio)
\section1 Iso Icon
\note The Iso Icon component is not available if you selected
\uicontrol {Qt 6} when \l{Creating Projects}{creating the project}.
The Iso Icon component specifies an icon from an ISO 7000 icon library as a
\l [QtQuickExtras] {Picture} component. The icon to use for the type and
its color can be specified.
To select an icon in the \uicontrol {ISO Icon Browser} in \QDS, select
the ISO icon in \l Navigator or \l {Form Editor}, and then select
\uicontrol {Choose Icon} in the context menu.
\image studio-iso-icon.png
You can use the \l{Picking Colors}{color picker} in \l Properties to
set the value of \uicontrol {Icon color}.
\image iso-icon-browser.png
\endif
\section1 Summary of Images
The following table lists the components that you can use to add images.
The \e Location column contains the tab name where you can find the
component in \uicontrol Components. The \e MCU column
indicates which components are supported on MCUs.
\table
\header
\li Icon
\li Name
\li Location
\li MCU
\li Purpose
\row
\li \inlineimage animated-image-icon16.png
\li \l [QtQuick]{AnimatedImage}{Animated Image}
\li Default Components - Basic
\li
\li An images that stores animations containing a series of frames,
such as those stored in GIF files.
\row
\li \inlineimage border-image-icon16.png
\li \l [QtQuick]{BorderImage}{Border Image}
\li Default Components - Basic
\li \inlineimage ok.png
\li An image that is used as a border or background.
\row
\li \inlineimage image-icon16.png
\li \l [QtQuick]{Image}
\li Default Components - Basic
\li \inlineimage ok.png
\li An image in one of the supported formats, including bitmap formats
such as PNG and JPEG and vector graphics formats such as SVG.
\if defined(qtdesignstudio)
\row
\li \inlineimage icons/iso-icons-16px.png
\li \l{Iso Icon}
\li Qt Quick Studio Components
\li
\li An icon from an ISO 7000 icon library specified as a \l Picture
component. You can select the icon to use and its color.
\note This component is not supported on Qt 6.
\endif
\endtable
*/
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