Compose things

2022-03-15 21:40:52 +03:00
parent b2588fbb6e
commit 8c5d6cd4a6
11 changed files with 532 additions and 33 deletions
--- a/mastodon/src/main/java/org/joinmastodon/android/ui/views/ComposeMediaLayout.java
+++ b/mastodon/src/main/java/org/joinmastodon/android/ui/views/ComposeMediaLayout.java
@@ -0,0 +1,97 @@
+package org.joinmastodon.android.ui.views;
+
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.View;
+import android.view.ViewGroup;
+
+import me.grishka.appkit.utils.V;
+
+public class ComposeMediaLayout extends ViewGroup{
+	private static final int MAX_WIDTH_DP=400;
+	private static final int GAP_DP=8;
+	private static final float ASPECT_RATIO=0.5625f;
+
+	public ComposeMediaLayout(Context context){
+		this(context, null);
+	}
+
+	public ComposeMediaLayout(Context context, AttributeSet attrs){
+		this(context, attrs, 0);
+	}
+
+	public ComposeMediaLayout(Context context, AttributeSet attrs, int defStyle){
+		super(context, attrs, defStyle);
+	}
+
+	@Override
+	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){
+		int mode=MeasureSpec.getMode(widthMeasureSpec);
+		@SuppressLint("SwitchIntDef")
+		int width=switch(mode){
+			case MeasureSpec.AT_MOST -> Math.min(V.dp(MAX_WIDTH_DP), MeasureSpec.getSize(widthMeasureSpec));
+			case MeasureSpec.EXACTLY -> MeasureSpec.getSize(widthMeasureSpec);
+			default -> throw new IllegalArgumentException("unsupported measure mode");
+		};
+		int height=Math.round(width*ASPECT_RATIO);
+		setMeasuredDimension(width, height);
+
+		// We don't really need this, but some layouts will freak out if you don't measure them
+		int childWidth, firstChildHeight, otherChildrenHeight=0;
+		int gap=V.dp(GAP_DP);
+		switch(getChildCount()){
+			case 0 -> {
+				return;
+			}
+			case 1 -> {
+				childWidth=width;
+				firstChildHeight=height;
+			}
+			case 2 -> {
+				childWidth=(width-gap)/2;
+				firstChildHeight=otherChildrenHeight=height;
+			}
+			case 3 -> {
+				childWidth=(width-gap)/2;
+				firstChildHeight=height;
+				otherChildrenHeight=(height-gap)/2;
+			}
+			default -> {
+				childWidth=(width-gap)/2;
+				firstChildHeight=otherChildrenHeight=(height-gap)/2;
+			}
+		}
+		for(int i=0;i<getChildCount();i++){
+			getChildAt(i).measure(childWidth | MeasureSpec.EXACTLY, (i==0 ? firstChildHeight : otherChildrenHeight) | MeasureSpec.EXACTLY);
+		}
+	}
+
+	@Override
+	protected void onLayout(boolean changed, int l, int t, int r, int b){
+		int gap=V.dp(GAP_DP);
+		int width=r-l;
+		int height=b-t;
+		int halfWidth=(width-gap)/2;
+		int halfHeight=(height-gap)/2;
+		switch(getChildCount()){
+			case 0 -> {}
+			case 1 -> getChildAt(0).layout(0, 0, width, height);
+			case 2 -> {
+				getChildAt(0).layout(0, 0, halfWidth, height);
+				getChildAt(1).layout(halfWidth+gap, 0, width, height);
+			}
+			case 3 -> {
+				getChildAt(0).layout(0, 0, halfWidth, height);
+				getChildAt(1).layout(halfWidth+gap, 0, width, halfHeight);
+				getChildAt(2).layout(halfWidth+gap, halfHeight+gap, width, height);
+			}
+			default -> {
+				getChildAt(0).layout(0, 0, halfWidth, halfHeight);
+				getChildAt(1).layout(halfWidth+gap, 0, width, halfHeight);
+				getChildAt(2).layout(0, halfHeight+gap, halfWidth, height);
+				getChildAt(3).layout(halfWidth+gap, halfHeight+gap, width, height);
+			}
+		}
+	}
+}