UnityCsReference/Modules/IMGUI/SliderHandler.cs at master · timFinn/UnityCsReference · GitHub

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// Unity C# reference source

// Copyright (c) Unity Technologies. For terms of use, see

// https://unity3d.com/legal/licenses/Unity_Reference_Only_License

using System;

using UnityEngine.Scripting;

namespace UnityEngine

{

// State for when we're dragging a slider.

internal class SliderState

{

[RequiredByNativeCode] // Created by reflection from SliderHandler.SliderState

public SliderState() {}

public float dragStartPos;

public float dragStartValue;

public bool isDragging;

}

// TODO: Make the thumb positioning / sizing be right

internal struct SliderHandler

{

readonly Rect position;

readonly float currentValue;

readonly float size;

readonly float start;

readonly float end;

readonly GUIStyle slider;

readonly GUIStyle thumb;

readonly GUIStyle thumbExtent;

readonly bool horiz;

readonly int id;

public SliderHandler(Rect position, float currentValue, float size, float start, float end, GUIStyle slider, GUIStyle thumb, bool horiz, int id, GUIStyle thumbExtent = null)

{

this.position = position;

this.currentValue = currentValue;

this.size = size;

this.start = start;

this.end = end;

this.slider = slider;

this.thumb = thumb;

this.thumbExtent = thumbExtent;

this.horiz = horiz;

this.id = id;

}

public float Handle()

{

if (slider == null || thumb == null)

return currentValue;

switch (CurrentEventType())

{

case EventType.MouseDown:

return OnMouseDown();

case EventType.MouseDrag:

return OnMouseDrag();

case EventType.MouseUp:

return OnMouseUp();

case EventType.Repaint:

return OnRepaint();

}

return currentValue;

}

private float OnMouseDown()

{

var thumbZone = ThumbSelectionRect();

var mouseOverThumb = GUIUtility.HitTest(thumbZone, CurrentEvent());

var boundingRect = Rect.zero;

// Bounding box that includes the slider and its thumb.

boundingRect.xMin = Math.Min(position.xMin, thumbZone.xMin);

boundingRect.xMax = Math.Max(position.xMax, thumbZone.xMax);

boundingRect.yMin = Math.Min(position.yMin, thumbZone.yMin);

boundingRect.yMax = Math.Max(position.yMax, thumbZone.yMax);

// if the click is outside this control, just bail out...

if (IsEmptySlider() || (!GUIUtility.HitTest(boundingRect, CurrentEvent()) && !mouseOverThumb))

return currentValue;

GUI.scrollTroughSide = 0;

GUIUtility.hotControl = id;

CurrentEvent().Use();

if (mouseOverThumb)

{

// We have a mousedown on the thumb

// Record where we're dragging from, so the user can get back.

StartDraggingWithValue(ClampedCurrentValue());

return currentValue;

}

GUI.changed = true;

// We're outside the thumb, but inside the trough.

// If we have a scrollSize, we do pgup/pgdn style movements

// if not, we just snap to the current position and begin tracking

if (SupportsPageMovements())

{

SliderState().isDragging = false;

GUI.nextScrollStepTime = SystemClock.now.AddMilliseconds(ScrollWaitDefinitions.firstWait);

GUI.scrollTroughSide = CurrentScrollTroughSide();

return PageMovementValue();

}

float newValue = ValueForCurrentMousePosition();

StartDraggingWithValue(newValue);

return Clamp(newValue);

}

private float OnMouseDrag()

{

if (GUIUtility.hotControl != id)

return currentValue;

var sliderState = SliderState();

if (!sliderState.isDragging)

return currentValue;

GUI.changed = true;

CurrentEvent().Use();

// Recalculate the value from the mouse position. this has the side effect that values are relative to the

// click point - no matter where inside the trough the original value was. Also means user can get back original value

// if he drags back to start position.

float deltaPos = MousePosition() - sliderState.dragStartPos;

var newValue = sliderState.dragStartValue + deltaPos / ValuesPerPixel();

return Clamp(newValue);

}

private float OnMouseUp()

{

if (GUIUtility.hotControl == id)

{

CurrentEvent().Use();

GUIUtility.hotControl = 0;

}

return currentValue;

}

private float OnRepaint()

{

bool hover = GUIUtility.HitTest(position, CurrentEvent());

slider.Draw(position, GUIContent.none, id, false, hover);

if (currentValue >= Mathf.Min(start, end) && currentValue <= Mathf.Max(start, end))

{

if (thumbExtent != null)

thumbExtent.Draw(ThumbExtRect(), GUIContent.none, id, false, hover);

thumb.Draw(ThumbRect(), GUIContent.none, id, false, hover);

}

if (GUIUtility.hotControl != id || !hover || IsEmptySlider())

return currentValue;

var thumbRect = ThumbRect();

// If the slider is horizontal then use its entire height to hit test on the thumb

if (this.horiz)

{

thumbRect.y = position.y;

thumbRect.height = position.height;

}

// ... otherwise use the entire width

else

{

thumbRect.x = position.x;

thumbRect.width = position.width;

}

if (GUIUtility.HitTest(thumbRect, CurrentEvent()))

{

if (GUI.scrollTroughSide != 0) // if was scrolling with "trough" and the thumb reached mouse - sliding action over

{

GUIUtility.hotControl = 0;

}

return currentValue;

}

GUI.InternalRepaintEditorWindow();

if (SystemClock.now < GUI.nextScrollStepTime)

return currentValue;

if (CurrentScrollTroughSide() != GUI.scrollTroughSide)

return currentValue;

GUI.nextScrollStepTime = SystemClock.now.AddMilliseconds(ScrollWaitDefinitions.regularWait);

if (SupportsPageMovements())

{

SliderState().isDragging = false;

GUI.changed = true;

return PageMovementValue();

}

return ClampedCurrentValue();

}

private EventType CurrentEventType()

{

return CurrentEvent().GetTypeForControl(id);

}

private int CurrentScrollTroughSide()

{

float mousePos = horiz ? CurrentEvent().mousePosition.x : CurrentEvent().mousePosition.y;

float thumbPos = horiz ? ThumbRect().x : ThumbRect().y;

return mousePos > thumbPos ? 1 : -1;

}

private bool IsEmptySlider()

{

return start == end;

}

private bool SupportsPageMovements()

{

return size != 0 && GUI.usePageScrollbars;

}

private float PageMovementValue()

{

var newValue = currentValue;

var sign = start > end ? -1 : 1;

if (MousePosition() > PageUpMovementBound())

newValue += size * sign * .9f;

else

newValue -= size * sign * .9f;

return Clamp(newValue);

}

private float PageUpMovementBound()

{

if (horiz)

return ThumbRect().xMax - position.x;

return ThumbRect().yMax - position.y;

}

private Event CurrentEvent()

{

return Event.current;

}

private float ValueForCurrentMousePosition()

{

if (horiz)

return (MousePosition() - ThumbRect().width * .5f) / ValuesPerPixel() + start - size * .5f;

return (MousePosition() - ThumbRect().height * .5f) / ValuesPerPixel() + start - size * .5f;

}

private float Clamp(float value)

{

return Mathf.Clamp(value, MinValue(), MaxValue());

}

private Rect ThumbSelectionRect()

{

var selectionRect = ThumbRect();

return selectionRect;

}

private void StartDraggingWithValue(float dragStartValue)

{

var state = SliderState();

state.dragStartPos = MousePosition();

state.dragStartValue = dragStartValue;

state.isDragging = true;

}

private SliderState SliderState()

{

return (SliderState)GUIUtility.GetStateObject(typeof(SliderState), id);

}

private Rect ThumbExtRect()

{

var rect = new Rect(0, 0, thumbExtent.fixedWidth, thumbExtent.fixedHeight) { center = ThumbRect().center };

return rect;

}

private Rect ThumbRect()

{

return horiz ? HorizontalThumbRect() : VerticalThumbRect();

}

private Rect VerticalThumbRect()

{

Rect contentRect = thumb.margin.Remove(slider.padding.Remove(position));

float thumbWidth = (thumb.fixedWidth != 0 ? thumb.fixedWidth : contentRect.width);

var thumbSize = ThumbSize();

var valuesPerPixel = ValuesPerPixel();

if (start < end)

{

return new Rect(

contentRect.x,

(ClampedCurrentValue() - start) * valuesPerPixel + contentRect.y,

thumbWidth,

size * valuesPerPixel + thumbSize);

}

else

{

return new Rect(

contentRect.x,

(ClampedCurrentValue() + size - start) * valuesPerPixel + contentRect.y,

thumbWidth,

size * -valuesPerPixel + thumbSize);

}

private Rect HorizontalThumbRect()

{

Rect contentRect = thumb.margin.Remove(slider.padding.Remove(position));

float thumbHeight = (thumb.fixedHeight != 0 ? thumb.fixedHeight : contentRect.height);

var thumbSize = ThumbSize();

var valuesPerPixel = ValuesPerPixel();

if (start < end)

return new Rect(

(ClampedCurrentValue() - start) * valuesPerPixel + contentRect.x,

contentRect.y,

size * valuesPerPixel + thumbSize,

thumbHeight);

return new Rect(

(ClampedCurrentValue() + size - start) * valuesPerPixel + contentRect.x,

contentRect.y,

size * -valuesPerPixel + thumbSize,

thumbHeight);

}

private float ClampedCurrentValue()

{

return Clamp(currentValue);

}

private float MousePosition()

{

if (horiz)

return CurrentEvent().mousePosition.x - position.x;

return CurrentEvent().mousePosition.y - position.y;

}

private float ValuesPerPixel()

{

var length = (end == start) ? 1 : end - start;

if (horiz)

return (position.width - slider.padding.horizontal - ThumbSize()) / length;

return (position.height - slider.padding.vertical - ThumbSize()) / length;

}

private float ThumbSize()

{

if (horiz)

return thumb.fixedWidth != 0 ? thumb.fixedWidth : thumb.padding.horizontal;

return thumb.fixedHeight != 0 ? thumb.fixedHeight : thumb.padding.vertical;

}

private float MaxValue()

{

return Mathf.Max(start, end) - size;

}

private float MinValue()

{

return Mathf.Min(start, end);

}

UnityCsReference/Modules/IMGUI/SliderHandler.cs at master · timFinn/UnityCsReference · GitHub

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