// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only

/*!
    \example SideMenu
    \ingroup studioexamples

    \title Side Menu
    \brief Illustrates how to create reusable components and an animated menu
    for applying 2D visual effects in Qt 5 projects.

    \image sidemenu.png "Side menu example application"

    \e {Side Menu} displays a menu bar and a side menu that slides open when
    users click the menu icon. The appearance of the menu bar buttons changes
    when users hover the cursor over them or select them.

    Each button opens an image file. The side menu can be used to apply
    \l {2D Effects}{graphical effects}, such as hue, saturation,
    and blur, to the images.

    \note Only a subset of effects is available if you select
    \uicontrol {Qt 6} when \l{Creating Projects}{creating the project}.

    \section1 Creating Reusable Buttons

    We select \uicontrol File > \uicontrol {New File} >
    \uicontrol {Qt Quick Controls} >
    \uicontrol {Custom Button} to create a reusable menu bar button
    that we call \e CustomButton.

    The button can have the following states: checked, hover, pressed, and
    normal. We construct the button using different images for the button
    background, frame, and front. We then add \l{Adding States}{states} in
    the \l States view for each of the button states. In each state, we turn
    the visibility of the appropriate images on or off in the button properties,
    to change the appearance of the button.

    \image sidemenu-custombutton-states.png "CustomButton component states"

    To change the button text when the button state changes, we bind the
    text property to the state of the button in the \l Properties view.
    When \e control is selected in the \l Navigator, we select the
    \uicontrol Actions menu for the \uicontrol Text property, and then select
    \uicontrol {Set Binding}. In the \uicontrol {Binding Editor}, we set the
    binding to \c control.state.

    \image sidemenu-custombutton-property-bindings.png

    We want the buttons to be checkable, so we set the
    \l {AbstractButton::}{checkable} property to \c true.

    We now select \uicontrol {Set when Condition} in the \uicontrol Actions menu
    for the states to bind the properties to the states using \c when
    conditions. First, we specify that a button instance enters the \e checked
    state when the \l {AbstractButton::}{checked} property is set to \c true.
    This is how the code will look in the \l{Code} view:

    \quotefromfile SideMenu/CustomButton.qml
    \skipto states: [
    \printuntil when

    We then bind the \e hover state to the \l {Control::}{hovered} property
    being set to \c true, while the \c checked and
    \l {AbstractButton::}{pressed} properties are set to \c false:

    \dots
    \skipto State {
    \printuntil when

    Finally, the button state is set to \e normal, when all the properties are
    set to \c false:

    \dots
    \skipto State {
    \printuntil when

    We can now use CustomButton instances to create a menu bar.

    \section1 Constructing a Menu Bar

    We construct the menu bar in the \e {MainFile.ui.qml} file using the
    \l {2D} view. The CustomButton component is listed in
    \uicontrol Components > \uicontrol {My Components}.
    We drag-and-drop several instances of the component to \uicontrol Navigator
    or the \uicontrol {2D} view and enclose them in a \uicontrol {Row Layout}
    component instance to lay them out as a menu bar.

    \image sidemenu-menubar.png

    We can change the properties of each CustomButton instance separately in
    the \uicontrol Properties view. We want only one of the menu bar buttons
    to be checked at any time, so that checking another button automatically
    unchecks the previously checked one. Therefore, we set the
    \l {AbstractButton::}{autoExclusive} property to \c true for all
    button instances.

    In addition, we set the \uicontrol Checked property to \c true for the
    first button instance on the menu bar to make it appear selected.

    We can now select the \inlineimage icons/run_small.png "Run button"
    (\uicontrol Run) button to run the application and test our menu bar.

    \section1 Creating a Side Menu

    We can now continue to create a side menu that slides open when users
    click the burger menu. We drag-and-drop a \l Text component from
    \uicontrol Components > \uicontrol {Default Components}
    > \uicontrol Basic and a \l {slider-control}{Slider} component from
    \uicontrol {Qt Quick Controls} to \uicontrol Navigator to create separate
    submenus for each set of effects we want to apply to the images. We use
    a background image for the menu background and a BurgerMenu custom
    component for the burger menu icon.

    \image sidemenu-ui.png "SliderMenu component"

    We add states to the \e {SideMenu.qml} file in the \uicontrol States view.
    When the application starts, the side menu is in the \e closed state, which
    means that it is hidden. When users click the burger menu, the \c onClicked
    \l{glossary-signal}{signal handler} triggers the \l{glossary-transition}
    {transition} to the \e opening state and runs an animation. When the
    animation finishes, the side menu state changes to \e open and the side
    menu is fully visible.

    When users click the burger menu again, the state changes to \e closing and
    another animation is run that closes the side menu. When the animation
    finishes, the side menu returns to the \e closed state.

    We select \uicontrol {Create New State} in the \uicontrol States view to add
    the states:

    \image sidemenu-states.png "Side menu states"

    We then select the \inlineimage icons/plus.png
    button in the \l Timeline view to add animation
    for transitions to the \e open and \e close states:

    \image sidemenu-timeline-settings.png "Side menu timeline settings"

    The closing animation is just the opening animation played backwards to
    hide the side menu. We want the opening animation to be slower than the
    closing animation, so we specify a shorter duration for the closing
    animation. This does not affect the duration of the timeline itself.

    We want to change the position of the outline and background images. To
    start recording the transition from the closed state to the open state,
    we select \e imageOutline in \uicontrol Navigator. We check that the
    playhead is at frame 0, and then select the \inlineimage icons/recordfill.png
    (\uicontrol {Auto Key (K)}) button (or press \key k).

    At frame 0, we set the X coordinate to -423 in \uicontrol Properties >
    \uicontrol {Geometry - 2D} > \uicontrol Position. We then move the playhead
    to frame 1000 and set the X coordinate to 0.

    When we deselect the record button to stop recording the timeline, the
    new timeline appears in the view.

    \image sidemenu-timeline.png "Timeline view"

    We then record the transition of the \e imageBackground image. At frame
    0, we set the X coordinate to -424 again. We then move the playhead to
    frame 400 and select \uicontrol {Insert Keyframe} in the
    \inlineimage icons/action-icon.png
    (\uicontrol Actions) menu of the X coordinate. We keep the value of the
    X coordinate -424. We then move the playhead to frame 1000 and set the X
    coordinate to 0.

    We select \inlineimage icons/animation.png "Timeline Settings button"
    to open the \uicontrol {Timeline Settings} dialog. In the
    \uicontrol {Transitions to states} field, we select the state to
    apply when the animation finishes. In the lower part of the
    dialog, we bind the states that don't have animations to fixed frames.

    For more information about using the timeline, see
    \l {Creating Timeline Animations}.

    \section1 Connecting the Burger Menu to Actions

    In \e {SideMenu.qml}, we use connections to bind the action of clicking
    the burger menu to the signal handler for triggering the opening or
    closing animation, depending on the current state. We create the connections
    in the \l{Connections} view.

    \image sidemenu-connections.png

    We use property changes to disable the burger menu until the animation
    finishes and to hide and show the side menu:

    \quotefromfile SideMenu/SideMenu.qml
    \skipto State {
    \printuntil },

    The side menu is fully visible and accepts input only in the \e open state.

    For more information about Connecting Components to Signals, see
    \l {Connecting Components to Signals}.

    \section1 Applying Effects

    We nest the effects in an effects stack and bind them to the
    \l {slider-control}{Slider} component instances. The effects apply
    to all the images in the example application, not just the
    currently open one.

    We use property bindings to connect the controls in the slider menu to
    \l {2D Effects}{graphical effects}. To have access to the
    properties from all the slider component instances, we export them as
    aliases in \e SliderMenu.ui.qml. We select \uicontrol {Export Property as Alias}
    in the \uicontrol Settings menu of the \uicontrol Value property in
    \uicontrol Properties > \uicontrol Slider.

    We open the \e {EffectStack.qml} file, and drag-and-drop components from
    \uicontrol Components > \uicontrol {Qt Quick Studio Effects} to
    \uicontrol Navigator to create the effect stack.

    \image sidemenu-effects-stack.png "Effects stack in the Navigator"

    We use an instance of the \l {Images}{Image} component as the last item in
    the stack to display images that we apply the effects to. We export the
    image source property as an \l{Adding Property Aliases}{alias} to be able
    to switch the image inside the stack.

    For more information about the available graphical effects, see
    \l {2D Effects}.
*/
