Add demo for orx-panel

orx-panel/README.md

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+# orx-panel
+
+The OPENRNDR UI toolkit

orx-panel/build.gradle

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+sourceSets {
+    demo {
+        java {
+            srcDirs = ["src/demo/kotlin"]
+            compileClasspath += main.getCompileClasspath()
+            runtimeClasspath += main.getRuntimeClasspath()
+        }
+    }
+}
+
+dependencies {
+    demoImplementation("org.openrndr:openrndr-extensions:$openrndrVersion")
+    demoRuntimeOnly("org.openrndr:openrndr-gl3:$openrndrVersion")
+    demoRuntimeOnly("org.openrndr:openrndr-gl3-natives-$openrndrOS:$openrndrVersion")
+    demoImplementation(sourceSets.getByName("main").output)
+}

orx-panel/src/demo/kotlin/DemoVerticalLayout01.kt

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+import org.openrndr.application
+import org.openrndr.color.ColorRGBa
+import org.openrndr.extensions.SingleScreenshot
+import org.openrndr.panel.controlManager
+import org.openrndr.panel.elements.div
+import org.openrndr.panel.elements.slider
+import org.openrndr.panel.style.*
+
+fun main() = application {
+    program {
+        // -- this block is for automation purposes only
+        if (System.getProperty("takeScreenshot") == "true") {
+            extend(SingleScreenshot()) {
+                this.outputFile = System.getProperty("screenshotPath")
+            }
+        }
+        val cm = controlManager {
+            styleSheet(has class_ "side-bar") {
+                this.height = 100.percent
+                this.width = 200.px
+                this.display = Display.FLEX
+                this.flexDirection = FlexDirection.Column
+                this.paddingLeft = 10.px
+                this.paddingRight = 10.px
+                this.background = Color.RGBa(ColorRGBa.GRAY)
+            }
+            styleSheet(has type "slider") {
+                this.marginTop = 25.px
+                this.marginBottom = 25.px
+            }
+            layout {
+                div("side-bar") {
+                    slider {
+                        label = "Slider 1"
+                    }
+                    slider {
+                        label = "Slider 2"
+                    }
+                }
+            }
+        }
+        extend(cm)
+        extend {
+
+        }
+    }
+}