Handles and processes the multitouch scale, transform and rotation events based on two-finger gestures. More...

#include <AUI/View/A2FingerTransformArea.h>

Public Member Functions
void	onPointerPressed (const APointerPressedEvent &event) override
	Called on pointer (mouse) released event.

void	onPointerMove (glm::vec2 pos, const APointerMoveEvent &event) override
	Handles pointer hover events.

void	onPointerReleased (const APointerReleasedEvent &event) override
	Called on pointer (mouse) released event.

bool	consumesClick (const glm::ivec2 &pos) override
	Determines whether this AView processes this click or passes it thru.

Public Member Functions inherited from AViewContainer
void	addView (const _< AView > &view)
	Add view to the container.

void	addView (size_t index, const _< AView > &view)
	Add view at specific index to the container.

void	addViews (AVector< _< AView > > views)
	Add all views from vector.

void	addViewCustomLayout (const _< AView > &view)
	Adds view to container without exposing it to the layout manager.

void	removeView (const _< AView > &view)
	Remove view from the container.

void	removeView (AView *view)
	Remove view from the container.

void	removeView (size_t index)
	Remove view from the container at specified index.

void	removeAllViews ()
	Remove all views from container.

void	setViews (AVector< _< AView > > views)
	Replace views.

void	setContents (const _< AViewContainer > &container)
	Moves (like via std::move) all children and layout of the specified container to this container.

const _unique< ALayout > &	getLayout () const noexcept
	Get layout manager of the container.

void	setLayout (_unique< ALayout > layout)
	Set new layout manager for this AViewContainerBase. DESTROYS OLD LAYOUT MANAGER WITH ITS VIEWS!!!

Public Member Functions inherited from AViewContainerBase
void	render (ARenderContext context) override
	Draws this AView. Noone should call this function except rendering routine.

void	onMouseEnter () override

void	onPointerMove (glm::vec2 pos, const APointerMoveEvent &event) override
	Handles pointer hover events.

void	onMouseLeave () override

void	onDpiChanged () override

void	onClickPrevented () override
	Called on AWindowBase::preventClickOnPointerRelease.

int	getContentMinimumWidth () override

int	getContentMinimumHeight () override

void	onPointerPressed (const APointerPressedEvent &event) override
	Called on pointer (mouse) released event.

void	onPointerDoubleClicked (const APointerPressedEvent &event) override

void	onPointerReleased (const APointerReleasedEvent &event) override
	Called on pointer (mouse) released event.

void	onScroll (const AScrollEvent &event) override

bool	onGesture (const glm::ivec2 &origin, const AGestureEvent &event) override

bool	consumesClick (const glm::ivec2 &pos) override
	Determines whether this AView processes this click or passes it thru.

void	setSize (glm::ivec2 size) override

void	setEnabled (bool enabled=true) override

auto	begin () const

auto	end () const

const AVector< _< AView > > &	getViews () const
	Get all views of the container.

const _unique< ALayout > &	getLayout () const noexcept
	Get layout manager of the container.

virtual _< AView >	getViewAt (glm::ivec2 pos, ABitField< AViewLookupFlags > flags=AViewLookupFlags::NONE) const noexcept
	Finds first direct child view under position.

_< AView >	getViewAtRecursive (glm::ivec2 pos, ABitField< AViewLookupFlags > flags=AViewLookupFlags::NONE) const noexcept
	Acts as AViewContainerBase::getViewAt but recursively (may include non-direct child).

template<aui::predicate< _< AView > > Callback>
bool	getViewAtRecursive (glm::ivec2 pos, const Callback &callback, ABitField< AViewLookupFlags > flags=AViewLookupFlags::NONE)
	Acts as AViewContainerBase::getViewAtRecursive but calls a callback instead of returning value.

template<aui::predicate< _< AView > > Callback>
bool	visitsViewRecursive (Callback &&callback, ABitField< AViewLookupFlags > flags=AViewLookupFlags::NONE)
	Performs recursive view traversal.

template<typename T>
_< T >	getViewAtRecursiveOfType (glm::ivec2 pos, ABitField< AViewLookupFlags > flags=AViewLookupFlags::NONE)
	Acts as AViewContainerBase::getViewAtRecursive but finds a view castable to specified template type.

void	setFocusChainTarget (_weak< AView > target)
	Set focus chain target.

_< AView >	focusChainTarget ()

void	applyGeometryToChildrenIfNecessary ()

void	onKeyDown (AInput::Key key) override

void	onKeyRepeat (AInput::Key key) override

void	onKeyUp (AInput::Key key) override

void	onCharEntered (char16_t c) override

bool	capturesFocus () override

const ASmallVector< PointerEventsMapping, 1 > &	pointerEventsMapping () const noexcept

void	forceUpdateLayoutRecursively () override

void	markMinContentSizeInvalid () override

void	markPixelDataInvalid (ARect< int > invalidArea) override
	A view requests to redraw it and passes it's coords relative to this.

Public Member Functions inherited from AView
auto	enabled () const
	Whether view is enabled (i.e., reacts to user).

auto	position () const
	Top left corner's position relative to top left corner's position of the parent AView.

auto	size () const
	Size, including content area, border and padding.

auto	expanding () const
	Expansion coefficient. Hints layout manager how much this AView should be extended relative to other AViews in the same container.

auto	visibility () const
	Visibility value.

void	redraw ()
	Request window manager to redraw this AView.

AWindowBase *	getWindow () const
	Determines window which this AView belongs to.

virtual void	drawStencilMask (ARenderContext ctx)

virtual void	postRender (ARenderContext ctx)
	Performs post-draw routines of this AView. Noone should call this function except rendering routine.

void	popStencilIfNeeded (ARenderContext ctx)

const AVector< AString > &	getAssNames () const noexcept

glm::ivec2	getPosition () const noexcept
	Top left corner's position relative to top left corner's position of the parent AView.

glm::ivec2	getCenterPointInWindow () const noexcept
	The center point position of the view relatively to top left corner of the window.

glm::ivec2	getSize () const noexcept
	Size, including content area, border and padding.

glm::ivec2	getMinSize () const noexcept

void	setMinSize (glm::ivec2 minSize) noexcept

void	setExtraStylesheet (_< AStylesheet > extraStylesheet)

void	setExtraStylesheet (AStylesheet &&extraStylesheet)

const _< AStylesheet > &	extraStylesheet () const noexcept

AOverflow	getOverflow () const
	Determines whether display graphics that go out of the bounds of this AView or not.

void	setOverflow (AOverflow overflow)

AOverflowMask	getOverflowMask () const
	Controls how does the overflow (stencil) mask is produced.

void	setOverflowMask (AOverflowMask overflow)

float	getBorderRadius () const
	border-radius, specified in ASS.

void	setBorderRadius (float radius)

int	getWidth () const

int	getHeight () const

int	getTotalOccupiedWidth () const

int	getTotalOccupiedHeight () const

glm::ivec2	getMinimumSizePlusMargin ()

const ABoxFields &	getMargin ()
	Returns the margin.

void	setMargin (const ABoxFields &margin)
	Sets the margin.

const ABoxFields &	getPadding ()
	Returns the padding.

void	setPadding (const ABoxFields &padding)
	Sets the padding.

virtual AString	debugString () const
	String which helps to identify this object in debug string output (i.e., for logging)

int	getTotalFieldHorizontal () const

int	getTotalFieldVertical () const

glm::ivec2	getTotalFieldSize () const

AViewContainerBase *	getParent () const
	Parent AView.

const AOptional< ACursor > &	getCursor () const
	Determines shape which should pointer take when it's above this AView.

void	setCursor (AOptional< ACursor > cursor)

glm::ivec2	getContentMinimumSize () noexcept

bool	isContentMinimumSizeInvalidated () noexcept

bool	hasFocus () const

virtual int	getMinimumWidth ()

virtual int	getMinimumHeight ()

glm::ivec2	getMinimumSize ()

void	setMaxSize (const glm::ivec2 &maxSize)

const glm::ivec2 &	getMaxSize () const

int	getContentWidth () const

int	getContentHeight () const

const glm::ivec2 &	getExpanding () const

void	setExpanding (glm::ivec2 expanding)
	Changes the expanding of view.

void	setExpanding (int expanding)
	Changes the expanding of view.

void	setExpanding ()

const _< AAnimator > &	getAnimator () const

void	setAnimator (const _< AAnimator > &animator)

void	getTransform (glm::mat4 &transform) const

int	getExpandingHorizontal () const

int	getExpandingVertical () const

aui::float_within_0_1	getOpacity () const

void	setOpacity (aui::float_within_0_1 opacity)

virtual void	setPosition (glm::ivec2 position)

void	setSizeForced (glm::ivec2 size)

virtual void	setGeometry (int x, int y, int width, int height)

void	setGeometry (const glm::ivec2 &position, const glm::ivec2 &size)

bool	isBlockClicksWhenPressed () const noexcept

void	setBlockClicksWhenPressed (bool value) noexcept

const glm::ivec2 &	getFixedSize ()
	Fixed size.

void	setFixedSize (glm::ivec2 size)

bool	isMouseHover () const noexcept

bool	isPressed () const noexcept

bool	isPressed (APointerIndex index) const noexcept

bool	isFocused () const

bool	isMouseEntered () const

Visibility	getVisibility () const

Visibility	getVisibilityRecursive () const

void	setVisibility (Visibility visibility) noexcept

void	setVisible (bool visible) noexcept

MouseCollisionPolicy	getMouseCollisionPolicy () const

void	setMouseCollisionPolicy (MouseCollisionPolicy mouseCollisionPolicy)

void	click ()

void	pack ()
	Sets minimal size.

void	focus (bool needFocusChainUpdate=true)
	Requests focus for this AView.

bool	hasIndirectParent (const _< AView > &v)
	Checks if the specified view is an indirect parent of this view.

glm::ivec2	getPositionInWindow () const

void	addAssName (const AString &assName)
	Adds an ASS class to this AView.

void	removeAssName (const AString &assName)
	Removes an ASS class to this AView.

AView &	operator<< (const AString &assName)

const _< AAssHelper > &	getAssHelper () const

const ass::PropertyListRecursive &	getCustomAss () const

void	setCustomStyle (ass::PropertyListRecursive rule)

void	ensureAssUpdated ()

_< AView >	sharedPtr ()

_weak< AView >	weakPtr ()

virtual void	onFocusAcquired ()

virtual void	onFocusLost ()

virtual bool	handlesNonMouseNavigation ()

void	setDisabled (bool disabled=true)

void	updateEnableState ()

void	enable ()

void	disable ()

void	operator+ (ass::PropertyListRecursive rule)
	Helper function for kAUI.h:with_style.

void	invalidateStateStyles ()
	Updates state selectors for ASS.

virtual bool	wantsTouchscreenKeyboard ()
	Returns true if view is textfield-like view which requires touchscreen keyboard when clicked.

void	setSkipUntilLayoutUpdate (bool skipUntilLayoutUpdate)

void	setFloating (AFloat f) noexcept
	Set floating value for AText.

AFloat	getFloating () const noexcept
	Floating value for AText.

Public Member Functions inherited from AObject
_< AObject >	sharedPtr ()

_weak< AObject >	weakPtr ()

template<typename Connectable, ACompatibleSlotFor< Connectable > Function>
void	connect (const Connectable &connectable, Function &&function)
	Connects signal or property to slot of `"this"` object.

void	setSignalsEnabled (bool enabled)

bool	isSignalsEnabled () const noexcept

template<ASignalInvokable T>
void	operator^ (T &&t)

_< AAbstractThread >	getThread () const

bool	isSlotsCallsOnlyOnMyThread () const noexcept

void	setSlotsCallsOnlyOnMyThread (bool slotsCallsOnlyOnMyThread)

Public Member Functions inherited from AObjectBase
	AObjectBase (AObjectBase &&rhs) noexcept

void	clearSignals () noexcept

Public Member Functions inherited from aui::noncopyable
	noncopyable (const noncopyable &)=delete

noncopyable &	operator= (const noncopyable &)=delete

Signals and public fields
emits< A2DTransform >	transformed

Signals and public fields inherited from AViewContainerBase
emits	childrenChanged
	Emitted when addView(s)/removeView/setLayout was called.

Signals and public fields inherited from AView
emits	viewGraphSubtreeChanged

emits< bool >	hoveredState

emits	mouseEnter

emits	mouseLeave

emits< bool, APointerIndex >	pressedState

emits< APointerIndex >	pressed

emits< APointerIndex >	released

emits< APointerIndex >	clickedButton
	Some mouse button clicked.

emits	clicked
	Left mouse button clicked.

emits< glm::ivec2, glm::ivec2 >	geometryChanged
	Geometry (position and size) changed.

emits< glm::ivec2 >	scrolled
	Scroll event.

emits< AInput::Key >	keyPressed
	Keyboard key pressed.

emits< AInput::Key >	keyReleased
	Keyboard key released.

emits	clickedRight
	Right mouse button clicked.

emits	clickedRightOrLongPressed
	Right mouse button clicked or long press gesture applied.

emits< APointerIndex >	doubleClicked

emits	customCssPropertyChanged

emits< bool >	focusState
	Focus state changed.

emits	focusAcquired

emits	focusLost

emits< _< AView > >	childFocused

Additional Inherited Members
Static Public Member Functions inherited from AObject
static void	disconnect ()

template<AAnySignal Signal, aui::derived_from< AObjectBase > Object, ACompatibleSlotFor< Signal > Function>
static void	connect (const Signal &signal, Object *object, Function &&function)
	Connects signal to the slot of the specified object.

template<AAnyProperty Property, aui::derived_from< AObjectBase > Object, typename Function>
static void	connect (const Property &property, Object *object, Function &&function)
	Connects property to the slot of the specified object.

template<APropertyReadable PropertySource, APropertyWritable PropertyDestination> requires requires { { propertySource } -> aui::convertible_to<std::decay_t<decltype(propertyDestination)>>; }
static void	connect (PropertySource &&propertySource, PropertyDestination &&propertyDestination)
	Connects source property to the destination property.

template<APropertyWritable PropertySource, APropertyWritable PropertyDestination> requires requires { { propertySource } -> aui::convertible_to<std::decay_t<decltype(propertyDestination)>>; { propertyDestination } -> aui::convertible_to<std::decay_t<decltype(propertySource)>>; }
static void	biConnect (PropertySource &&propertySource, PropertyDestination &&propertyDestination)
	Connects source property to the destination property and opposite (bidirectionally).

template<AAnySignalOrProperty Connectable, aui::derived_from< AObjectBase > Object, ACompatibleSlotFor< Connectable > Function>
static void	connect (const Connectable &connectable, Object &object, Function &&function)
	Connects signal or property to the slot of the specified object.

template<AAnySignalOrProperty Connectable, aui::derived_from< AObjectBase > Object, ACompatibleSlotFor< Connectable > Function>
static void	connect (const Connectable &connectable, _< Object > object, Function &&function)
	Connects signal or property to the slot of the specified object.

template<AAnySignalOrProperty Connectable, aui::derived_from< AObjectBase > Object, typename Function>
static void	connect (const Connectable &connectable, ASlotDef< Object *, Function > slotDef)
	Connects signal to the slot of the specified object. Slot is packed to single argument.

template<AAnyProperty Property, typename Object, ACompatibleSlotFor< Property > Function> requires (!aui::derived_from<Object, AObject>)
static void	connect (const Property &property, _< Object > object, Function &&function)
	Connects signal or property to the slot of the specified non-AObject type.

static void	moveToThread (aui::no_escape< AObject > object, _< AAbstractThread > thread)

Protected Member Functions inherited from AViewContainerBase
void	drawView (const _< AView > &view, ARenderContext contextOfTheContainer)

template<typename Iterator>
void	drawViews (Iterator begin, Iterator end, ARenderContext contextPassedToContainer)

void	invalidateAllStyles () override
	Invalidates all styles, causing to iterate over all rules in global and parent stylesheets.

void	onViewGraphSubtreeChanged () override
	Called when direct or indirect parent has changed.

void	invalidateAssHelper () override
	Resets mAssHelper.

void	setViews (AVector< _< AView > > views)
	Replace views.

void	addViewCustomLayout (const _< AView > &view)
	Adds view to container without exposing it to the layout manager.

void	addViews (AVector< _< AView > > views)
	Add all views from vector.

void	addView (const _< AView > &view)
	Add view to the container.

void	addView (size_t index, const _< AView > &view)
	Add view at specific index to the container.

void	removeView (const _< AView > &view)
	Remove view from the container.

void	removeView (AView *view)
	Remove view from the container.

void	removeView (size_t index)
	Remove view from the container at specified index.

void	removeAllViews ()
	Remove all views from container.

void	setContents (const _< AViewContainer > &container)
	Moves (like via std::move) all children and layout of the specified container to this container.

void	setLayout (_unique< ALayout > layout)
	Set new layout manager for this AViewContainerBase. DESTROYS OLD LAYOUT MANAGER WITH ITS VIEWS!!!

void	renderChildren (ARenderContext contextPassedToContainer)

virtual void	applyGeometryToChildren ()

Protected Member Functions inherited from AView
bool	transformGestureEventsToDesktop (const glm::ivec2 &origin, const AGestureEvent &event)
	Converts touch screen events to desktop.

void	applyAssRule (const ass::PropertyList &propertyList)

void	applyAssRule (const ass::PropertyListRecursive &propertyList)

virtual AMenuModel	composeContextMenu ()
	Produce context (right click) menu.

virtual void	commitStyle ()

Protected Member Functions inherited from AObject
void	setThread (_< AAbstractThread > thread)
	Set thread of the object.

Protected Attributes inherited from AViewContainerBase
AVector< _< AView > >	mViews

bool	mWantsLayoutUpdate = true

glm::ivec2	mLastLayoutUpdateSize {0, 0}

Protected Attributes inherited from AView
AViewContainerBase *	mParent = nullptr
	Parent AView.

std::array< ass::prop::IPropertyBase *, int(ass::prop::PropertySlot::COUNT)>	mAss
	Drawing list, or baking drawing commands so that you don't have to parse the ASS every time.

ass::PropertyListRecursive	mCustomStyleRule
	Custom ASS Rules.

AOptional< ACursor >	mCursor = ACursor::DEFAULT
	Determines shape which should pointer take when it's above this AView.

glm::ivec2	mPosition = { 0, 0 }
	Top left corner's position relative to top left corner's position of the parent AView.

emits< glm::ivec2 >	mPositionChanged
	Position changed.

glm::ivec2	mSize = { 20, 20 }
	Size, including content area, border and padding.

emits< glm::ivec2 >	mSizeChanged
	Size changed.

AOptional< glm::ivec2 >	mCachedMinContentSize

bool	mMarkedMinContentSizeInvalid = false

bool	mRedrawRequested = false
	Redraw requested flag for this particular view/.

glm::ivec2	mMinSize = {0, 0}
	Minimal size.

glm::ivec2	mMaxSize = {0x7fffffff, 0x7fffffff}
	Maximal size.

glm::ivec2	mFixedSize = {0, 0}
	Fixed size.

ABoxFields	mMargin
	Margin, which defines the spacing around this AView. Processed by the layout manager.

ABoxFields	mPadding
	Padding, which defines the spacing around content area inside the view. Processed by AView implementation.

AVector< AString >	mAssNames
	ASS class names.

bool	mSkipUntilLayoutUpdate = true
	If set to true, AViewContainer is obligated ignore this view. This value is set to false by AView::setGeometry.

Detailed Description

Handles and processes the multitouch scale, transform and rotation events based on two-finger gestures.

Represents a translucent area that handles and processes multi-finger transformation gestures (i.e. pinch-to-zoom, move, rotate). A2FingerTransformArea is a container, so the transformed view should be somewhere inside. A2FingerTransformArea does not apply any transformation though, so you can control transformation behaviour.

The transformation data is emitted on delta basis via transform signal. This allows to easily incorporate A2FingerTransformArea to transforming routines, including limit handling.

Consider the following example, where the transformation is applied through ASS styles:

_<AView> multitouchDemo() {
  return _new<A2FingerTransformArea>() let {    
      it->setCustomStyle({
        MinSize { 256_dp },
        Border { 1_px, AColor::BLACK },
      });
      _<AView> blackRect = Stacked { _new<ALabel>("A2FingerTransformArea") with_style {
        FixedSize{200_dp, 100_dp},
        BackgroundSolid{AColor::BLACK},
        TextColor{AColor::WHITE},
        ATextAlign::CENTER,
      }};
      ALayoutInflater::inflate(it, Stacked { blackRect });
      connect(it->transformed, blackRect, [blackRect = blackRect.get(),
                                           keptTransform = _new<A2DTransform>()](const A2DTransform& transform) {
          keptTransform->applyDelta(transform);
          blackRect->setCustomStyle({
              TransformOffset{AMetric(keptTransform->offset.x, AMetric::T_PX),
                              AMetric(keptTransform->offset.y, AMetric::T_PX)},
              TransformScale{keptTransform->scale},
              TransformRotate{keptTransform->rotation},
          });
      });
  };
}

This example renders to the following result:

Member Function Documentation

◆ consumesClick()

bool A2FingerTransformArea::consumesClick ( const glm::ivec2 & pos )

overridevirtual

Determines whether this AView processes this click or passes it thru.

Parameters

pos	mouse position

Returns: true if AView processes this click

Used in AViewContainer::getViewAt method subset, thus affecting click event handling.

Reimplemented from AView.

◆ onPointerMove()

void A2FingerTransformArea::onPointerMove	(	glm::vec2	pos,
		const APointerMoveEvent &	event )

overridevirtual

Handles pointer hover events.

Parameters

pos	event position
event	event description

Note: If the view is pressed, it would still received move events. Use AView::isMouseHover to check is the pointer actually over view or not. See AView::onPointerReleased for more info.

Reimplemented from AView.

◆ onPointerPressed()

void A2FingerTransformArea::onPointerPressed ( const APointerPressedEvent & event )

overridevirtual

Called on pointer (mouse) released event.

Parameters

event event

Reimplemented from AView.

◆ onPointerReleased()

void A2FingerTransformArea::onPointerReleased ( const APointerReleasedEvent & event )

overridevirtual

Called on pointer (mouse) released event.

Parameters

event event

Note: To handle clicks, you should use AView::clicked signal instead. View still receives pointer move and released events even if cursor goes outside the view boundaries, or other exclusive event appeared (i.e. scrollarea scroll). AView::clicked emitted only if release event occurred inside view and no other event has prevented click gesture. See APointerReleasedEvent::triggerClick.

Reimplemented from AView.

The documentation for this class was generated from the following files:

aui.views/src/AUI/View/A2FingerTransformArea.h
aui.views/src/AUI/View/A2FingerTransformArea.cpp

Inheritance diagram for A2FingerTransformArea:

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Collaboration diagram for A2FingerTransformArea:

[legend]

Public Member Functions

Signals and public fields

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ consumesClick()

◆ onPointerMove()

◆ onPointerPressed()

◆ onPointerReleased()