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added CustomDrawGroup which allows for components to have their own draw call

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Ellpeck 2019-09-08 16:30:55 +02:00
parent 4a7fcd7570
commit 20d7b95891
2 changed files with 39 additions and 2 deletions
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32
MLEM.Ui/Elements/CustomDrawGroup.cs Normal file
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@ -0,0 +1,32 @@
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
namespace MLEM.Ui.Elements {
public class CustomDrawGroup : Group {
public Matrix Transform;
public BeginDelegate BeginImpl;
public CustomDrawGroup(Anchor anchor, Vector2 size, Matrix? transform = null, BeginDelegate beginImpl = null, bool setHeightBasedOnChildren = true) :
base(anchor, size, setHeightBasedOnChildren) {
this.Transform = transform ?? Matrix.Identity;
this.BeginImpl = beginImpl ?? ((time, batch, alpha, blendState, samplerState, matrix) => batch.Begin(SpriteSortMode.Deferred, blendState, samplerState, null, null, null, matrix));
}
public delegate void BeginDelegate(GameTime time, SpriteBatch batch, float alpha, BlendState blendState, SamplerState samplerState, Matrix matrix);
public override void Draw(GameTime time, SpriteBatch batch, float alpha) {
// this is left empty because child components are drawn in DrawEarly
}
public override void DrawEarly(GameTime time, SpriteBatch batch, float alpha, BlendState blendState, SamplerState samplerState, Matrix matrix) {
var mat = matrix * this.Transform;
this.BeginImpl(time, batch, alpha, blendState, samplerState, mat);
// draw child components in custom begin call
base.Draw(time, batch, alpha);
batch.End();
base.DrawEarly(time, batch, alpha, blendState, samplerState, mat);
}
}
}

9
MLEM.Ui/Elements/Panel.cs
View file

@ -110,12 +110,17 @@ namespace MLEM.Ui.Elements {
batch.GraphicsDevice.Clear(Color.Transparent);
// offset children by the render target's location
var area = this.GetRenderTargetArea();
batch.Begin(SpriteSortMode.Deferred, blendState, samplerState, null, null, null, Matrix.CreateTranslation(-area.X, -area.Y, 0));
var trans = Matrix.CreateTranslation(-area.X, -area.Y, 0);
// do the usual draw, but within the render target
batch.Begin(SpriteSortMode.Deferred, blendState, samplerState, null, null, null, trans);
base.Draw(time, batch, alpha);
batch.End();
// also draw any children early within the render target with the translation applied
base.DrawEarly(time, batch, alpha, blendState, samplerState, matrix * trans);
batch.GraphicsDevice.SetRenderTarget(null);
} else {
base.DrawEarly(time, batch, alpha, blendState, samplerState, matrix);
}
base.DrawEarly(time, batch, alpha, blendState, samplerState, matrix);
}
public override Element GetElementUnderPos(Point position) {