MDCの内部実装から学ぶ 表現力の高いViewの作り方

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X © DMM.com ิ଍ɿ%SBXBCMF$POTUBOU4UBUFͱNVUBUF Drawable ConstantState

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X © DMM.com ิ଍ɿ%SBXBCMF$POTUBOU4UBUFͱNVUBUF Drawable ConstantState ConstantState.newDrawable

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X © DMM.com ิ଍ɿ%SBXBCMF$POTUBOU4UBUFͱNVUBUF Drawable ConstantState Drawable

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X © DMM.com ิ଍ɿ%SBXBCMF$POTUBOU4UBUFͱNVUBUF Drawable ConstantState Drawable Drawable.mutate

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X © DMM.com ิ଍ɿ%SBXBCMF$POTUBOU4UBUFͱNVUBUF Drawable ConstantState Drawable ConstantState

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X © DMM.com • MaterialShapeDrawableState • extends ConstantState w ShapeAppearanceModel w ͲΜͳܗঢ়ͷ%SBXBCMF͔ͷ৘ใ • ShapePathProvider w ShapeAppearanceModelΛPathʹม׵͢Δ ొ৔ਓ෺

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X © DMM.com ߏ੒ MaterialShapeDrawable MaterialShapeDrawableState ShapeAppearanceModel

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X © DMM.com 4IBQF"QQFBSBODF.PEFM ShapeAppearanceModel CornerTreatment topLeftCorner topRightCorner bottomRightCorner bottomLeftCorner CornerSize topLeftCornerSize topRightCornerSize bottomRightCornerSize bottomLeftCornerSize EdgeTreatment topEdge rightEdge bottomEdge leftEdge

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X © DMM.com MaterialShapeDrawable.draw ඳըͷ࢓૊Έ MaterialShapeDrawable .calculateShapePath / calculatePath ShapePathProvider .calculatePath MaterialShapeDrawable .drawFillShape / drawStrokeShape Canvas.drawPath / drawRoundRect ShapeAppearanceModel Path Path Path

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X © DMM.com MaterialShapeDrawable.setInterpolation( float interpolation) EdgeTreatment.getEdgePath( float length, float center, float interpolation, @NonNull ShapePath shapePath) CornerTreatment.getCornerPath( @NonNull ShapePath shapePath, float angle, float interpolation, @NonNull RectF bounds, @NonNull CornerSize size) #PUUPN"QQ#BS

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X © DMM.com val model = ShapeAppearanceModel.Builder() .setAllCornerSizes(AbsoluteCornerSize(cornerSize)) .setBottomEdge( SpeechBalloonBottomEdgeTreatment(arrowHeight, arrowRight) ) .build() 4IBQF"QQFBSBODF.PEFMΛ࡞Δ

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X © DMM.com override fun getEdgePath( length: Float, center: Float, interpolation: Float, shapePath: ShapePath ) { shapePath.lineTo(arrowRight, 0f) shapePath.lineTo(arrowRight, -arrowHeight) shapePath.lineTo(arrowRight + arrowHeight, 0f) shapePath.lineTo(length, 0f) } &EHF5SFBUNFOUΛ࣮૷͢Δ

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X © DMM.com val background = MaterialShapeDrawable(model).apply { fillColor = ColorStateList.valueOf(Color.WHITE) this.elevation = elevation setPadding(padding, padding, padding, padding) } speechBalloon.background = background .BUFSJBM4IBQF%SBXBCMFΛ࡞Δ

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X © DMM.com public void getOutline(@NonNull Outline outline) { if (drawableState.shadowCompatMode == SHADOW_COMPAT_MODE_ALWAYS) { // Don't draw the native shadow if we're always rendering with compat shadow. return; } if (isRoundRect()) { float radius = getTopLeftCornerResolvedSize(); outline.setRoundRect(getBounds(), radius); return; } calculatePath(getBoundsAsRectF(), path); if (path.isConvex() || Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) { outline.setConvexPath(path); } } .BUFSJBM4IBQF%SBXBCMFHFU0VUMJOF

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X © DMM.com w 7BMVF"OJNBUPS0CKFDU"OJNBUPS ObjectAnimator.ofFloat(view, “translationX”, 0f, 100f).apply { duration = 1000L start() } ValueAnimator.ofFloat(0f, 100f).apply { duration = 1000L addUpdateListener { animator -> view.translationX = animator.animatedValue as Float } start() }

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