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rui/pointerEvents.go

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package rui
import (
"strings"
)
const (
// PointerDown is the constant for "pointer-down" property tag.
// The "pointer-down" event is fired when a pointer becomes active. For mouse, it is fired when
// the device transitions from no buttons depressed to at least one button depressed.
// For touch, it is fired when physical contact is made with the digitizer.
// For pen, it is fired when the stylus makes physical contact with the digitizer.
// The main listener format: func(View, PointerEvent).
// The additional listener formats: func(PointerEvent), func(View), and func().
PointerDown = "pointer-down"
// PointerUp is the constant for "pointer-up" property tag.
// The "pointer-up" event is fired when a pointer is no longer active.
// The main listener format: func(View, PointerEvent).
// The additional listener formats: func(PointerEvent), func(View), and func().
PointerUp = "pointer-up"
// PointerMove is the constant for "pointer-move" property tag.
// The "pointer-move" event is fired when a pointer changes coordinates.
// The main listener format: func(View, PointerEvent).
// The additional listener formats: func(PointerEvent), func(View), and func().
PointerMove = "pointer-move"
// PointerCancel is the constant for "pointer-cancel" property tag.
// The "pointer-cancel" event is fired if the pointer will no longer be able to generate events
// (for example the related device is deactivated).
// The main listener format: func(View, PointerEvent).
// The additional listener formats: func(PointerEvent), func(View), and func().
PointerCancel = "pointer-cancel"
// PointerOut is the constant for "pointer-out" property tag.
// The "pointer-out" event is fired for several reasons including: pointing device is moved out
// of the hit test boundaries of an element; firing the pointerup event for a device
// that does not support hover (see "pointer-up"); after firing the pointercancel event (see "pointer-cancel");
// when a pen stylus leaves the hover range detectable by the digitizer.
// The main listener format: func(View, PointerEvent).
// The additional listener formats: func(PointerEvent), func(View), and func().
PointerOut = "pointer-out"
// PointerOver is the constant for "pointer-over" property tag.
// The "pointer-over" event is fired when a pointing device is moved into an view's hit test boundaries.
// The main listener format: func(View, PointerEvent).
// The additional listener formats: func(PointerEvent), func(View), and func().
PointerOver = "pointer-over"
)
type PointerEvent struct {
MouseEvent
// PointerID is a unique identifier for the pointer causing the event.
PointerID int
// Width is the width (magnitude on the X axis), in pixels, of the contact geometry of the pointer.
Width float64
// Height is the height (magnitude on the Y axis), in pixels, of the contact geometry of the pointer.
Height float64
// Pressure is the normalized pressure of the pointer input in the range 0 to 1, where 0 and 1 represent
// the minimum and maximum pressure the hardware is capable of detecting, respectively.
Pressure float64
// TangentialPressure is the normalized tangential pressure of the pointer input (also known
// as barrel pressure or cylinder stress) in the range -1 to 1, where 0 is the neutral position of the control.
TangentialPressure float64
// TiltX is the plane angle (in degrees, in the range of -90 to 90) between the YZ plane
// and the plane containing both the pointer (e.g. pen stylus) axis and the Y axis.
TiltX float64
// TiltY is the plane angle (in degrees, in the range of -90 to 90) between the XZ plane
// and the plane containing both the pointer (e.g. pen stylus) axis and the X axis.
TiltY float64
// Twist is the clockwise rotation of the pointer (e.g. pen stylus) around its major axis in degrees,
// with a value in the range 0 to 359.
Twist float64
// PointerType indicates the device type that caused the event ("mouse", "pen", "touch", etc.)
PointerType string
// IsPrimary indicates if the pointer represents the primary pointer of this pointer type.
IsPrimary bool
}
func valueToPointerListeners(value interface{}) ([]func(View, PointerEvent), bool) {
if value == nil {
return nil, true
}
switch value := value.(type) {
case func(View, PointerEvent):
return []func(View, PointerEvent){value}, true
case func(PointerEvent):
fn := func(view View, event PointerEvent) {
value(event)
}
return []func(View, PointerEvent){fn}, true
case func(View):
fn := func(view View, event PointerEvent) {
value(view)
}
return []func(View, PointerEvent){fn}, true
case func():
fn := func(view View, event PointerEvent) {
value()
}
return []func(View, PointerEvent){fn}, true
case []func(View, PointerEvent):
if len(value) == 0 {
return nil, true
}
for _, fn := range value {
if fn == nil {
return nil, false
}
}
return value, true
case []func(PointerEvent):
count := len(value)
if count == 0 {
return nil, true
}
listeners := make([]func(View, PointerEvent), count)
for i, v := range value {
if v == nil {
return nil, false
}
listeners[i] = func(view View, event PointerEvent) {
v(event)
}
}
return listeners, true
case []func(View):
count := len(value)
if count == 0 {
return nil, true
}
listeners := make([]func(View, PointerEvent), count)
for i, v := range value {
if v == nil {
return nil, false
}
listeners[i] = func(view View, event PointerEvent) {
v(view)
}
}
return listeners, true
case []func():
count := len(value)
if count == 0 {
return nil, true
}
listeners := make([]func(View, PointerEvent), count)
for i, v := range value {
if v == nil {
return nil, false
}
listeners[i] = func(view View, event PointerEvent) {
v()
}
}
return listeners, true
case []interface{}:
count := len(value)
if count == 0 {
return nil, true
}
listeners := make([]func(View, PointerEvent), count)
for i, v := range value {
if v == nil {
return nil, false
}
switch v := v.(type) {
case func(View, PointerEvent):
listeners[i] = v
case func(PointerEvent):
listeners[i] = func(view View, event PointerEvent) {
v(event)
}
case func(View):
listeners[i] = func(view View, event PointerEvent) {
v(view)
}
case func():
listeners[i] = func(view View, event PointerEvent) {
v()
}
default:
return nil, false
}
}
return listeners, true
}
return nil, false
}
var pointerEvents = map[string]struct{ jsEvent, jsFunc string }{
PointerDown: {jsEvent: "onpointerdown", jsFunc: "pointerDownEvent"},
PointerUp: {jsEvent: "onpointerup", jsFunc: "pointerUpEvent"},
PointerMove: {jsEvent: "onpointermove", jsFunc: "pointerMoveEvent"},
PointerCancel: {jsEvent: "onpointercancel", jsFunc: "pointerCancelEvent"},
PointerOut: {jsEvent: "onpointerout", jsFunc: "pointerOutEvent"},
PointerOver: {jsEvent: "onpointerover", jsFunc: "pointerOverEvent"},
}
func (view *viewData) setPointerListener(tag string, value interface{}) bool {
listeners, ok := valueToPointerListeners(value)
if !ok {
notCompatibleType(tag, value)
return false
}
if listeners == nil {
view.removePointerListener(tag)
} else if js, ok := pointerEvents[tag]; ok {
view.properties[tag] = listeners
if view.created {
updateProperty(view.htmlID(), js.jsEvent, js.jsFunc+"(this, event)", view.Session())
}
} else {
return false
}
return true
}
func (view *viewData) removePointerListener(tag string) {
delete(view.properties, tag)
if view.created {
if js, ok := pointerEvents[tag]; ok {
updateProperty(view.htmlID(), js.jsEvent, "", view.Session())
}
}
}
func getPointerListeners(view View, subviewID string, tag string) []func(View, PointerEvent) {
if subviewID != "" {
view = ViewByID(view, subviewID)
}
if view != nil {
if value := view.Get(tag); value != nil {
if result, ok := value.([]func(View, PointerEvent)); ok {
return result
}
}
}
return []func(View, PointerEvent){}
}
func pointerEventsHtml(view View, buffer *strings.Builder) {
for tag, js := range pointerEvents {
if value := view.getRaw(tag); value != nil {
if listeners, ok := value.([]func(View, PointerEvent)); ok && len(listeners) > 0 {
buffer.WriteString(js.jsEvent + `="` + js.jsFunc + `(this, event)" `)
}
}
}
}
func (event *PointerEvent) init(data DataObject) {
event.MouseEvent.init(data)
event.PointerID, _ = dataIntProperty(data, "pointerId")
event.Width = dataFloatProperty(data, "width")
event.Height = dataFloatProperty(data, "height")
event.Pressure = dataFloatProperty(data, "pressure")
event.TangentialPressure = dataFloatProperty(data, "tangentialPressure")
event.TiltX = dataFloatProperty(data, "tiltX")
event.TiltY = dataFloatProperty(data, "tiltY")
event.Twist = dataFloatProperty(data, "twist")
value, _ := data.PropertyValue("pointerType")
event.PointerType = value
event.IsPrimary = dataBoolProperty(data, "isPrimary")
}
func handlePointerEvents(view View, tag string, data DataObject) {
listeners := getPointerListeners(view, "", tag)
if len(listeners) == 0 {
return
}
var event PointerEvent
event.init(data)
for _, listener := range listeners {
listener(view, event)
}
}
// GetPointerDownListeners returns the "pointer-down" listener list. If there are no listeners then the empty list is returned.
// If the second argument (subviewID) is "" then a value from the first argument (view) is returned.
func GetPointerDownListeners(view View, subviewID string) []func(View, PointerEvent) {
return getPointerListeners(view, subviewID, PointerDown)
}
// GetPointerUpListeners returns the "pointer-up" listener list. If there are no listeners then the empty list is returned.
// If the second argument (subviewID) is "" then a value from the first argument (view) is returned.
func GetPointerUpListeners(view View, subviewID string) []func(View, PointerEvent) {
return getPointerListeners(view, subviewID, PointerUp)
}
// GetPointerMoveListeners returns the "pointer-move" listener list. If there are no listeners then the empty list is returned.
// If the second argument (subviewID) is "" then a value from the first argument (view) is returned.
func GetPointerMoveListeners(view View, subviewID string) []func(View, PointerEvent) {
return getPointerListeners(view, subviewID, PointerMove)
}
// GetPointerCancelListeners returns the "pointer-cancel" listener list. If there are no listeners then the empty list is returned.
// If the second argument (subviewID) is "" then a value from the first argument (view) is returned.
func GetPointerCancelListeners(view View, subviewID string) []func(View, PointerEvent) {
return getPointerListeners(view, subviewID, PointerCancel)
}
// GetPointerOverListeners returns the "pointer-over" listener list. If there are no listeners then the empty list is returned.
// If the second argument (subviewID) is "" then a value from the first argument (view) is returned.
func GetPointerOverListeners(view View, subviewID string) []func(View, PointerEvent) {
return getPointerListeners(view, subviewID, PointerOver)
}
// GetPointerOutListeners returns the "pointer-out" listener list. If there are no listeners then the empty list is returned.
// If the second argument (subviewID) is "" then a value from the first argument (view) is returned.
func GetPointerOutListeners(view View, subviewID string) []func(View, PointerEvent) {
return getPointerListeners(view, subviewID, PointerOut)
}