moved to root

inspector/Views/Slider.js

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+/*
+ * Copyright (C) 2013, 2015 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+WI.Slider = class Slider extends WI.Object
+{
+    constructor()
+    {
+        super();
+
+        this._element = document.createElement("div");
+        this._element.className = "slider";
+        this._element.tabIndex = 0;
+
+        this._knob = this._element.appendChild(document.createElement("img"));
+
+        this._value = 0;
+        this._knobY = 0;
+        this._maxY = 0;
+
+        this._element.addEventListener("mousedown", this);
+        this._element.addEventListener("keydown", this._handleKeyDown.bind(this));
+    }
+
+    // Public
+
+    get element()
+    {
+        return this._element;
+    }
+
+    get value()
+    {
+        return this._value;
+    }
+
+    set value(value)
+    {
+        value = Math.max(Math.min(value, 1), 0);
+
+        if (value === this._value) {
+            this.recalculateKnobY();
+            return;
+        }
+
+        this.knobY = value;
+
+        if (this.delegate && typeof this.delegate.sliderValueDidChange === "function")
+            this.delegate.sliderValueDidChange(this, value);
+    }
+
+    set knobY(value)
+    {
+        this._value = value;
+        this._knobY = Math.round((1 - value) * this.maxY);
+        this._knob.style.setProperty("--translate-y", `${this._knobY}px`);
+    }
+
+    get maxY()
+    {
+        if (this._maxY <= 0 && document.body.contains(this._element))
+            this._maxY = Math.max(this._element.offsetHeight - Math.ceil(WI.Slider.KnobWidth / 2), 0);
+
+        return this._maxY;
+    }
+
+    recalculateKnobY()
+    {
+        this._maxY = 0;
+        this.knobY = this._value;
+    }
+
+    // Protected
+
+    handleEvent(event)
+    {
+        switch (event.type) {
+        case "mousedown":
+            this._handleMousedown(event);
+            break;
+        case "mousemove":
+            this._handleMousemove(event);
+            break;
+        case "mouseup":
+            this._handleMouseup(event);
+            break;
+        }
+    }
+
+    // Private
+
+    _handleMousedown(event)
+    {
+        if (event.button !== 0 || event.ctrlKey)
+            return;
+
+        if (event.target !== this._knob)
+            this.value = 1 - ((this._localPointForEvent(event).y - 3) / this.maxY);
+
+        this._startKnobY = this._knobY;
+        this._startMouseY = this._localPointForEvent(event).y;
+
+        this._element.classList.add("dragging");
+
+        window.addEventListener("mousemove", this, true);
+        window.addEventListener("mouseup", this, true);
+
+        this._element.focus();
+    }
+
+    _handleMousemove(event)
+    {
+        let dy = this._localPointForEvent(event).y - this._startMouseY;
+        let y = Math.max(Math.min(this._startKnobY + dy, this.maxY), 0);
+
+        this.value = 1 - (y / this.maxY);
+    }
+
+    _handleMouseup(event)
+    {
+        this._element.classList.remove("dragging");
+
+        window.removeEventListener("mousemove", this, true);
+        window.removeEventListener("mouseup", this, true);
+    }
+
+    _handleKeyDown(event)
+    {
+        let y = 0;
+        let step = event.shiftKey ? 0.1 : 0.01;
+
+        switch (event.keyIdentifier) {
+        case "Down":
+            y -= step;
+            break;
+        case "Up":
+            y += step;
+            break;
+        }
+
+        if (y) {
+            event.preventDefault();
+            this.value += y;
+        }
+    }
+
+    _localPointForEvent(event)
+    {
+        // We convert all event coordinates from page coordinates to local coordinates such that the slider
+        // may be transformed using CSS Transforms and interaction works as expected.
+        let rect = this._element.getBoundingClientRect();
+        return {
+            x: event.pageX - rect.x,
+            y: event.pageY - rect.y,
+        };
+    }
+};
+
+WI.Slider.KnobWidth = 13;