In-game editor UI improvements

core/src/mindustry/world/Block.java

@@ -920,6 +920,11 @@ public class Block extends UnlockableContent implements Senseable{
         placeBegan(tile, previous);
     }
 
+    /** Called when building of this block ends. */
+    public void placeEnded(Tile tile, @Nullable Unit builder){
+
+    }
+
     /** Called right before building of this block begins. */
     public void beforePlaceBegan(Tile tile, Block previous){
 

core/src/mindustry/world/Build.java

@@ -199,6 +199,10 @@ public class Build{
 
         if(tile == null) return false;
 
+        if(!type.canPlaceOn(tile, team, rotation)){
+            return false;
+        }
+
         //floors have different checks
         if(type.isFloor()){
             return type.isOverlay() ? tile.overlay() != type : tile.floor() != type;
@@ -213,10 +217,6 @@ public class Build{
             return false;
         }
 
-        if(!type.canPlaceOn(tile, team, rotation)){
-            return false;
-        }
-
         int offsetx = -(type.size - 1) / 2;
         int offsety = -(type.size - 1) / 2;
 

core/src/mindustry/world/blocks/ConstructBlock.java

@@ -110,6 +110,8 @@ public class ConstructBlock extends Block{
             if(shouldPlay()) block.placeSound.at(tile, block.placePitchChange ? calcPitch(true) : 1f);
         }
 
+        block.placeEnded(tile, builder);
+
         Events.fire(new BlockBuildEndEvent(tile, builder, team, false, config));
     }
 

core/src/mindustry/world/blocks/environment/RemoveOre.java

@@ -0,0 +1,51 @@
+package mindustry.world.blocks.environment;
+
+import arc.graphics.g2d.*;
+import arc.util.*;
+import mindustry.content.*;
+import mindustry.entities.units.*;
+import mindustry.game.*;
+import mindustry.gen.*;
+import mindustry.world.*;
+
+public class RemoveOre extends OverlayFloor{
+
+    public RemoveOre(String name){
+        super(name);
+
+        allowRectanglePlacement = true;
+        placeEffect = Fx.rotateBlock;
+        instantBuild = true;
+        ignoreBuildDarkness = true;
+        placeableLiquid = true;
+        inEditor = false;
+        variants = 0;
+    }
+
+    @Override
+    public void drawPlan(BuildPlan plan, Eachable<BuildPlan> list, boolean valid, float alpha){
+        Draw.reset();
+        Draw.alpha(alpha * (valid ? 1f : 0.2f));
+        float prevScale = Draw.scl;
+        Draw.scl *= plan.animScale;
+        drawPlanRegion(plan, list);
+        Draw.scl = prevScale;
+        Draw.reset();
+    }
+
+    @Override
+    public boolean canPlaceOn(Tile tile, Team team, int rotation){
+        return tile.overlay() != Blocks.air;
+    }
+
+    @Override
+    public boolean canReplace(Block other){
+        return true;
+    }
+
+    @Override
+    public void placeEnded(Tile tile, @Nullable Unit builder){
+        tile.setOverlay(Blocks.air);
+    }
+
+}

core/src/mindustry/world/blocks/environment/RemoveWall.java

@@ -0,0 +1,50 @@
+package mindustry.world.blocks.environment;
+
+import arc.graphics.g2d.*;
+import arc.util.*;
+import mindustry.content.*;
+import mindustry.entities.units.*;
+import mindustry.game.*;
+import mindustry.gen.*;
+import mindustry.world.*;
+
+public class RemoveWall extends Block{
+
+    public RemoveWall(String name){
+        super(name);
+
+        allowRectanglePlacement = true;
+        placeEffect = Fx.rotateBlock;
+        instantBuild = true;
+        ignoreBuildDarkness = true;
+        placeableLiquid = true;
+        inEditor = false;
+    }
+
+    @Override
+    public void drawPlan(BuildPlan plan, Eachable<BuildPlan> list, boolean valid, float alpha){
+        Draw.reset();
+        Draw.alpha(alpha * (valid ? 1f : 0.2f));
+        float prevScale = Draw.scl;
+        Draw.scl *= plan.animScale;
+        drawPlanRegion(plan, list);
+        Draw.scl = prevScale;
+        Draw.reset();
+    }
+
+    @Override
+    public boolean canPlaceOn(Tile tile, Team team, int rotation){
+        return tile.block() != Blocks.air;
+    }
+
+    @Override
+    public boolean canReplace(Block other){
+        return other != Blocks.air && !other.synthetic();
+    }
+
+    @Override
+    public void placeEnded(Tile tile, @Nullable Unit builder){
+        tile.setBlock(Blocks.air);
+    }
+
+}