mirror of https://github.com/anoshenko/rui.git
288 lines
10 KiB
Go
288 lines
10 KiB
Go
package rui
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const (
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// Perspective is the name of the SizeUnit property that determines the distance between the z = 0 plane
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// and the user in order to give a 3D-positioned element some perspective. Each 3D element
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// with z > 0 becomes larger; each 3D-element with z < 0 becomes smaller.
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// The default value is 0 (no 3D effects).
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Perspective = "perspective"
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// PerspectiveOriginX is the name of the SizeUnit property that determines the x-coordinate of the position
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// at which the viewer is looking. It is used as the vanishing point by the Perspective property.
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// The default value is 50%.
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PerspectiveOriginX = "perspective-origin-x"
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// PerspectiveOriginY is the name of the SizeUnit property that determines the y-coordinate of the position
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// at which the viewer is looking. It is used as the vanishing point by the Perspective property.
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// The default value is 50%.
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PerspectiveOriginY = "perspective-origin-y"
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// BackfaceVisible is the name of the bool property that sets whether the back face of an element is
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// visible when turned towards the user. Values:
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// true - the back face is visible when turned towards the user (default value);
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// false - the back face is hidden, effectively making the element invisible when turned away from the user.
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BackfaceVisible = "backface-visibility"
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// OriginX is the name of the SizeUnit property that determines the x-coordinate of the point around which
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// a view transformation is applied.
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// The default value is 50%.
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OriginX = "origin-x"
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// OriginY is the name of the SizeUnit property that determines the y-coordinate of the point around which
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// a view transformation is applied.
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// The default value is 50%.
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OriginY = "origin-y"
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// OriginZ is the name of the SizeUnit property that determines the z-coordinate of the point around which
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// a view transformation is applied.
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// The default value is 50%.
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OriginZ = "origin-z"
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// TranslateX is the name of the SizeUnit property that specify the x-axis translation value
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// of a 2D/3D translation
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TranslateX = "translate-x"
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// TranslateY is the name of the SizeUnit property that specify the y-axis translation value
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// of a 2D/3D translation
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TranslateY = "translate-y"
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// TranslateZ is the name of the SizeUnit property that specify the z-axis translation value
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// of a 3D translation
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TranslateZ = "translate-z"
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// ScaleX is the name of the float property that specify the x-axis scaling value of a 2D/3D scale
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// The default value is 1.
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ScaleX = "scale-x"
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// ScaleY is the name of the float property that specify the y-axis scaling value of a 2D/3D scale
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// The default value is 1.
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ScaleY = "scale-y"
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// ScaleZ is the name of the float property that specify the z-axis scaling value of a 3D scale
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// The default value is 1.
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ScaleZ = "scale-z"
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// Rotate is the name of the AngleUnit property that determines the angle of the view rotation.
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// A positive angle denotes a clockwise rotation, a negative angle a counter-clockwise one.
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Rotate = "rotate"
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// RotateX is the name of the float property that determines the x-coordinate of the vector denoting
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// the axis of rotation which could between 0 and 1.
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RotateX = "rotate-x"
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// RotateY is the name of the float property that determines the y-coordinate of the vector denoting
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// the axis of rotation which could between 0 and 1.
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RotateY = "rotate-y"
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// RotateZ is the name of the float property that determines the z-coordinate of the vector denoting
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// the axis of rotation which could between 0 and 1.
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RotateZ = "rotate-z"
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// SkewX is the name of the AngleUnit property that representing the angle to use to distort
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// the element along the abscissa. The default value is 0.
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SkewX = "skew-x"
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// SkewY is the name of the AngleUnit property that representing the angle to use to distort
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// the element along the ordinate. The default value is 0.
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SkewY = "skew-y"
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)
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func getTransform3D(style Properties, session Session) bool {
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perspective, ok := sizeProperty(style, Perspective, session)
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return ok && perspective.Type != Auto && perspective.Value != 0
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}
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func getPerspectiveOrigin(style Properties, session Session) (SizeUnit, SizeUnit) {
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x, _ := sizeProperty(style, PerspectiveOriginX, session)
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y, _ := sizeProperty(style, PerspectiveOriginY, session)
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return x, y
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}
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func getOrigin(style Properties, session Session) (SizeUnit, SizeUnit, SizeUnit) {
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x, _ := sizeProperty(style, OriginX, session)
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y, _ := sizeProperty(style, OriginY, session)
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z, _ := sizeProperty(style, OriginZ, session)
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return x, y, z
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}
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func getSkew(style Properties, session Session) (AngleUnit, AngleUnit, bool) {
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skewX, okX := angleProperty(style, SkewX, session)
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skewY, okY := angleProperty(style, SkewY, session)
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return skewX, skewY, okX || okY
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}
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func getTranslate(style Properties, session Session) (SizeUnit, SizeUnit, SizeUnit) {
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x, _ := sizeProperty(style, TranslateX, session)
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y, _ := sizeProperty(style, TranslateY, session)
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z, _ := sizeProperty(style, TranslateZ, session)
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return x, y, z
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}
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func (style *viewStyle) transform(session Session) string {
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buffer := allocStringBuilder()
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defer freeStringBuilder(buffer)
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skewX, skewY, skewOK := getSkew(style, session)
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if skewOK {
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buffer.WriteString(`skew(`)
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buffer.WriteString(skewX.cssString())
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buffer.WriteRune(',')
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buffer.WriteString(skewY.cssString())
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buffer.WriteRune(')')
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}
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x, y, z := getTranslate(style, session)
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scaleX, okScaleX := floatTextProperty(style, ScaleX, session, 1)
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scaleY, okScaleY := floatTextProperty(style, ScaleY, session, 1)
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if getTransform3D(style, session) {
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if x.Type != Auto || y.Type != Auto || z.Type != Auto {
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if buffer.Len() > 0 {
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buffer.WriteRune(' ')
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}
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buffer.WriteString(`translate3d(`)
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buffer.WriteString(x.cssString("0", session))
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buffer.WriteRune(',')
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buffer.WriteString(y.cssString("0", session))
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buffer.WriteRune(',')
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buffer.WriteString(z.cssString("0", session))
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buffer.WriteRune(')')
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}
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scaleZ, okScaleZ := floatTextProperty(style, ScaleZ, session, 1)
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if okScaleX || okScaleY || okScaleZ {
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if buffer.Len() > 0 {
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buffer.WriteRune(' ')
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}
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buffer.WriteString(`scale3d(`)
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buffer.WriteString(scaleX)
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buffer.WriteRune(',')
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buffer.WriteString(scaleY)
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buffer.WriteRune(',')
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buffer.WriteString(scaleZ)
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buffer.WriteRune(')')
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}
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if angle, ok := angleProperty(style, Rotate, session); ok {
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rotateX, _ := floatTextProperty(style, RotateX, session, 1)
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rotateY, _ := floatTextProperty(style, RotateY, session, 1)
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rotateZ, _ := floatTextProperty(style, RotateZ, session, 1)
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if buffer.Len() > 0 {
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buffer.WriteRune(' ')
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}
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buffer.WriteString(`rotate3d(`)
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buffer.WriteString(rotateX)
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buffer.WriteRune(',')
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buffer.WriteString(rotateY)
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buffer.WriteRune(',')
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buffer.WriteString(rotateZ)
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buffer.WriteRune(',')
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buffer.WriteString(angle.cssString())
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buffer.WriteRune(')')
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}
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} else {
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if x.Type != Auto || y.Type != Auto {
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if buffer.Len() > 0 {
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buffer.WriteRune(' ')
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}
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buffer.WriteString(`translate(`)
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buffer.WriteString(x.cssString("0", session))
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buffer.WriteRune(',')
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buffer.WriteString(y.cssString("0", session))
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buffer.WriteRune(')')
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}
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if okScaleX || okScaleY {
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if buffer.Len() > 0 {
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buffer.WriteRune(' ')
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}
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buffer.WriteString(`scale(`)
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buffer.WriteString(scaleX)
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buffer.WriteRune(',')
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buffer.WriteString(scaleY)
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buffer.WriteRune(')')
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}
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if angle, ok := angleProperty(style, Rotate, session); ok {
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if buffer.Len() > 0 {
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buffer.WriteRune(' ')
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}
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buffer.WriteString(`rotate(`)
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buffer.WriteString(angle.cssString())
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buffer.WriteRune(')')
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}
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}
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return buffer.String()
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}
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func (style *viewStyle) writeViewTransformCSS(builder cssBuilder, session Session) {
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if getTransform3D(style, session) {
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if perspective, ok := sizeProperty(style, Perspective, session); ok && perspective.Type != Auto && perspective.Value != 0 {
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builder.add(`perspective`, perspective.cssString("0", session))
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}
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x, y := getPerspectiveOrigin(style, session)
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if x.Type != Auto || y.Type != Auto {
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builder.addValues(`perspective-origin`, ` `, x.cssString("50%", session), y.cssString("50%", session))
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}
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if backfaceVisible, ok := boolProperty(style, BackfaceVisible, session); ok {
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if backfaceVisible {
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builder.add(`backface-visibility`, `visible`)
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} else {
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builder.add(`backface-visibility`, `hidden`)
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}
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}
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x, y, z := getOrigin(style, session)
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if x.Type != Auto || y.Type != Auto || z.Type != Auto {
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builder.addValues(`transform-origin`, ` `, x.cssString("50%", session), y.cssString("50%", session), z.cssString("0", session))
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}
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} else {
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x, y, _ := getOrigin(style, session)
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if x.Type != Auto || y.Type != Auto {
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builder.addValues(`transform-origin`, ` `, x.cssString("50%", session), y.cssString("50%", session))
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}
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}
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builder.add(`transform`, style.transform(session))
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}
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func (view *viewData) updateTransformProperty(tag string) bool {
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htmlID := view.htmlID()
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session := view.session
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switch tag {
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case Perspective:
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updateCSSStyle(htmlID, session)
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case PerspectiveOriginX, PerspectiveOriginY:
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if getTransform3D(view, session) {
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x, y := GetPerspectiveOrigin(view)
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value := ""
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if x.Type != Auto || y.Type != Auto {
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value = x.cssString("50%", session) + " " + y.cssString("50%", session)
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}
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session.updateCSSProperty(htmlID, "perspective-origin", value)
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}
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case BackfaceVisible:
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if getTransform3D(view, session) {
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if GetBackfaceVisible(view) {
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session.updateCSSProperty(htmlID, BackfaceVisible, "visible")
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} else {
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session.updateCSSProperty(htmlID, BackfaceVisible, "hidden")
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}
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}
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case OriginX, OriginY, OriginZ:
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x, y, z := getOrigin(view, session)
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value := ""
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if getTransform3D(view, session) {
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if x.Type != Auto || y.Type != Auto || z.Type != Auto {
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value = x.cssString("50%", session) + " " + y.cssString("50%", session) + " " + z.cssString("50%", session)
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}
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} else {
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if x.Type != Auto || y.Type != Auto {
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value = x.cssString("50%", session) + " " + y.cssString("50%", session)
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}
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}
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session.updateCSSProperty(htmlID, "transform-origin", value)
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case SkewX, SkewY, TranslateX, TranslateY, TranslateZ, ScaleX, ScaleY, ScaleZ, Rotate, RotateX, RotateY, RotateZ:
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session.updateCSSProperty(htmlID, "transform", view.transform(session))
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default:
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return false
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}
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return true
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}
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