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Add smooth scrolling to the ScrollPanelWidget

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This commit is contained in:
Pavlos Touboulidis
2014-06-13 12:18:09 +03:00
parent 53930fdc81
commit 628c524494
4 changed files with 95 additions and 39 deletions
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128
OpenRA.Game/Widgets/ScrollPanelWidget.cs
View File

@@ -16,9 +16,17 @@ using OpenRA.Primitives;
namespace OpenRA.Widgets
{
public interface ILayout { void AdjustChild(Widget w); void AdjustChildren(); }
public interface ILayout
{
void AdjustChild(Widget w);
void AdjustChildren();
}
public enum ScrollPanelAlign { Bottom, Top }
public enum ScrollPanelAlign
{
Bottom,
Top
}
public class ScrollPanelWidget : Widget
{
@@ -26,22 +34,47 @@ namespace OpenRA.Widgets
public int ItemSpacing = 2;
public int ButtonDepth = ChromeMetrics.Get<int>("ButtonDepth");
public string Background = "scrollpanel-bg";
public int ContentHeight = 0;
public int ContentHeight;
public ILayout Layout;
public int MinimumThumbSize = 10;
public ScrollPanelAlign Align = ScrollPanelAlign.Top;
public bool CollapseHiddenChildren = false;
protected float ListOffset = 0;
protected bool UpPressed = false;
protected bool DownPressed = false;
protected bool ThumbPressed = false;
public bool CollapseHiddenChildren;
public float SmoothScrollSpeed = 0.333f;
protected bool UpPressed;
protected bool DownPressed;
protected bool ThumbPressed;
protected Rectangle upButtonRect;
protected Rectangle downButtonRect;
protected Rectangle backgroundRect;
protected Rectangle scrollbarRect;
protected Rectangle thumbRect;
public ScrollPanelWidget() { Layout = new ListLayout(this); }
// The target value is the list offset we're trying to reach
float targetListOffset;
// The current value is the actual list offset at the moment
float currentListOffset;
// Setting "smooth" to true will only update the target list offset.
// Setting "smooth" to false will also set the current list offset,
// i.e. it will scroll immediately.
//
// For example, scrolling with the mouse wheel will use smooth
// scrolling to give a nice visual effect that makes it easier
// for the user to follow. Dragging the scrollbar's thumb, however,
// will scroll to the desired position immediately.
protected void SetListOffset(float value, bool smooth)
{
targetListOffset = value;
if (!smooth)
currentListOffset = value;
}
public ScrollPanelWidget()
{
Layout = new ListLayout(this);
}
public override void RemoveChildren()
{
@@ -81,8 +114,8 @@ namespace OpenRA.Widgets
var ScrollbarHeight = rb.Height - 2 * ScrollbarWidth;
var thumbHeight = ContentHeight == 0 ? 0 : Math.Max(MinimumThumbSize, (int)(ScrollbarHeight*Math.Min(rb.Height*1f/ContentHeight, 1f)));
var thumbOrigin = rb.Y + ScrollbarWidth + (int)((ScrollbarHeight - thumbHeight)*(-1f*ListOffset/(ContentHeight - rb.Height)));
var thumbHeight = ContentHeight == 0 ? 0 : Math.Max(MinimumThumbSize, (int)(ScrollbarHeight * Math.Min(rb.Height * 1f / ContentHeight, 1f)));
var thumbOrigin = rb.Y + ScrollbarWidth + (int)((ScrollbarHeight - thumbHeight) * (-1f * currentListOffset / (ContentHeight - rb.Height)));
if (thumbHeight == ScrollbarHeight)
thumbHeight = 0;
@@ -93,10 +126,10 @@ namespace OpenRA.Widgets
thumbRect = new Rectangle(rb.Right - ScrollbarWidth, thumbOrigin, ScrollbarWidth, thumbHeight);
var upHover = Ui.MouseOverWidget == this && upButtonRect.Contains(Viewport.LastMousePos);
var upDisabled = thumbHeight == 0 || ListOffset >= 0;
var upDisabled = thumbHeight == 0 || currentListOffset >= 0;
var downHover = Ui.MouseOverWidget == this && downButtonRect.Contains(Viewport.LastMousePos);
var downDisabled = thumbHeight == 0 || ListOffset <= Bounds.Height - ContentHeight;
var downDisabled = thumbHeight == 0 || currentListOffset <= Bounds.Height - ContentHeight;
var thumbHover = Ui.MouseOverWidget == this && thumbRect.Contains(Viewport.LastMousePos);
WidgetUtils.DrawPanel(Background, backgroundRect);
@@ -123,38 +156,44 @@ namespace OpenRA.Widgets
Game.Renderer.DisableScissor();
}
public override int2 ChildOrigin { get { return RenderOrigin + new int2(0, (int)ListOffset); } }
public override int2 ChildOrigin { get { return RenderOrigin + new int2(0, (int)currentListOffset); } }
public override Rectangle GetEventBounds()
{
return EventBounds;
}
void Scroll(int amount)
void Scroll(int amount, bool smooth = false)
{
ListOffset += amount * Game.Settings.Game.UIScrollSpeed;
ListOffset = Math.Min(0,Math.Max(Bounds.Height - ContentHeight, ListOffset));
var newTarget = targetListOffset + amount * Game.Settings.Game.UIScrollSpeed;
newTarget = Math.Min(0, Math.Max(Bounds.Height - ContentHeight, newTarget));
SetListOffset(newTarget, smooth);
}
public void ScrollToBottom()
public void ScrollToBottom(bool smooth = false)
{
ListOffset = Align == ScrollPanelAlign.Top ?
var value = Align == ScrollPanelAlign.Top ?
Math.Min(0, Bounds.Height - ContentHeight) :
Bounds.Height - ContentHeight;
SetListOffset(value, smooth);
}
public void ScrollToTop()
public void ScrollToTop(bool smooth = false)
{
ListOffset = Align == ScrollPanelAlign.Top ? 0 :
var value = Align == ScrollPanelAlign.Top ? 0 :
Math.Max(0, Bounds.Height - ContentHeight);
SetListOffset(value, smooth);
}
public bool ScrolledToBottom
{
get { return ListOffset == Math.Min(0, Bounds.Height - ContentHeight) || ContentHeight <= Bounds.Height; }
get { return targetListOffset == Math.Min(0, Bounds.Height - ContentHeight) || ContentHeight <= Bounds.Height; }
}
public void ScrollToItem(string itemKey)
public void ScrollToItem(string itemKey, bool smooth = false)
{
var item = Children.FirstOrDefault(c =>
{
@@ -166,17 +205,31 @@ namespace OpenRA.Widgets
return;
// Scroll the item to be visible
if (item.Bounds.Top + ListOffset < 0)
ListOffset = ItemSpacing - item.Bounds.Top;
float? newOffset = null;
if (item.Bounds.Top + currentListOffset < 0)
newOffset = ItemSpacing - item.Bounds.Top;
if (item.Bounds.Bottom + ListOffset > RenderBounds.Height)
ListOffset = RenderBounds.Height - item.Bounds.Bottom - ItemSpacing;
if (item.Bounds.Bottom + currentListOffset > RenderBounds.Height)
newOffset = RenderBounds.Height - item.Bounds.Bottom - ItemSpacing;
if (newOffset.HasValue)
SetListOffset(newOffset.Value, smooth);
}
public override void Tick ()
public override void Tick()
{
if (UpPressed) Scroll(1);
if (DownPressed) Scroll(-1);
if (UpPressed)
Scroll(1);
if (DownPressed)
Scroll(-1);
var offsetDiff = targetListOffset - currentListOffset;
var absOffsetDiff = Math.Abs(offsetDiff);
if (absOffsetDiff > 1f)
currentListOffset += offsetDiff * SmoothScrollSpeed.Clamp(0.1f, 1.0f);
else
SetListOffset(targetListOffset, false);
}
public override bool YieldMouseFocus(MouseInput mi)
@@ -186,11 +239,12 @@ namespace OpenRA.Widgets
}
int2 lastMouseLocation;
public override bool HandleMouseInput(MouseInput mi)
{
if (mi.Event == MouseInputEvent.Scroll)
{
Scroll(mi.ScrollDelta);
Scroll(mi.ScrollDelta, true);
return true;
}
@@ -210,12 +264,14 @@ namespace OpenRA.Widgets
{
var rb = RenderBounds;
var ScrollbarHeight = rb.Height - 2 * ScrollbarWidth;
var thumbHeight = ContentHeight == 0 ? 0 : Math.Max(MinimumThumbSize, (int)(ScrollbarHeight*Math.Min(rb.Height*1f/ContentHeight, 1f)));
var oldOffset = ListOffset;
ListOffset += (int)((lastMouseLocation.Y - mi.Location.Y)*(ContentHeight - rb.Height)*1f/(ScrollbarHeight - thumbHeight));
ListOffset = Math.Min(0,Math.Max(rb.Height - ContentHeight, ListOffset));
var thumbHeight = ContentHeight == 0 ? 0 : Math.Max(MinimumThumbSize, (int)(ScrollbarHeight * Math.Min(rb.Height * 1f / ContentHeight, 1f)));
var oldOffset = currentListOffset;
if (oldOffset != ListOffset)
var newOffset = currentListOffset + ((int)((lastMouseLocation.Y - mi.Location.Y) * (ContentHeight - rb.Height) * 1f / (ScrollbarHeight - thumbHeight)));
newOffset = Math.Min(0, Math.Max(rb.Height - ContentHeight, newOffset));
SetListOffset(newOffset, false);
if (oldOffset != newOffset)
lastMouseLocation = mi.Location;
}
else

2
OpenRA.Mods.RA/Widgets/Logic/IngameChatLogic.cs
View File

@@ -161,7 +161,7 @@ namespace OpenRA.Mods.RA.Widgets.Logic
var scrolledToBottom = chatScrollPanel.ScrolledToBottom;
chatScrollPanel.AddChild(template);
if (scrolledToBottom)
chatScrollPanel.ScrollToBottom();
chatScrollPanel.ScrollToBottom(smooth: true);
Sound.PlayNotification(modRules, null, "Sounds", "ChatLine", null);
}

2
OpenRA.Mods.RA/Widgets/Logic/LobbyLogic.cs
View File

@@ -568,7 +568,7 @@ namespace OpenRA.Mods.RA.Widgets.Logic
var scrolledToBottom = chatPanel.ScrolledToBottom;
chatPanel.AddChild(template);
if (scrolledToBottom)
chatPanel.ScrollToBottom();
chatPanel.ScrollToBottom(smooth: true);
Sound.PlayNotification(modRules, null, "Sounds", "ChatLine", null);
}

2
OpenRA.Mods.RA/Widgets/Logic/MapChooserLogic.cs
View File

@@ -76,7 +76,7 @@ namespace OpenRA.Mods.RA.Widgets.Logic
{
var uid = visibleMaps.Random(Game.CosmeticRandom);
selectedUid = uid;
scrollpanel.ScrollToItem(uid);
scrollpanel.ScrollToItem(uid, smooth: true);
};
randomMapButton.IsDisabled = () => visibleMaps == null || visibleMaps.Count == 0;
}