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Extract LibraryItem thumbnail generator for reuse

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This commit is contained in:
John Lewin 2018-10-06 09:20:27 -07:00
parent c0408733c1
commit 3cd4dbdde6
2 changed files with 111 additions and 88 deletions
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109
MatterControlLib/Library/Widgets/ListView/ListViewItemBase.cs
View file

@ -44,9 +44,6 @@ namespace MatterHackers.MatterControl.CustomWidgets
{
public class ListViewItemBase : GuiWidget
{
private static ImageBuffer defaultFolderIcon = AggContext.StaticData.LoadIcon(Path.Combine("FileDialog", "folder.png")).SetPreMultiply();
private static ImageBuffer defaultItemIcon = AggContext.StaticData.LoadIcon(Path.Combine("FileDialog", "file.png"));
protected ThemeConfig theme;
protected ListViewItem listViewItem;
protected View3DWidget view3DWidget;
@ -74,64 +71,22 @@ namespace MatterHackers.MatterControl.CustomWidgets
public async Task LoadItemThumbnail()
{
ILibraryItem libraryItem = listViewItem.Model;
ILibraryContainer libraryContainer = listViewItem.Container;
// Load from cache via LibraryID
var thumbnail = ApplicationController.Instance.Thumbnails.LoadCachedImage(libraryItem, thumbWidth, thumbHeight);
if (thumbnail != null)
{
this.SetItemThumbnail(thumbnail);
return;
}
if (thumbnail == null)
{
// Ask the container - allows the container to provide its own interpretation of the item thumbnail
thumbnail = await libraryContainer.GetThumbnail(libraryItem, thumbWidth, thumbHeight);
}
if (thumbnail == null && libraryItem is IThumbnail)
{
// If the item provides its own thumbnail, try to collect it
thumbnail = await (libraryItem as IThumbnail).GetThumbnail(thumbWidth, thumbHeight);
}
if (thumbnail == null)
{
// Ask content provider - allows type specific thumbnail creation
var contentProvider = ApplicationController.Instance.Library.GetContentProvider(libraryItem);
if (contentProvider != null)
// On first draw, lookup and set best thumbnail
await ApplicationController.Instance.Library.LoadItemThumbnail(
this.SetItemThumbnail,
(meshContentProvider) =>
{
// Before we have a thumbnail set to the content specific thumbnail
thumbnail = contentProvider.DefaultImage;
// Store meshContentProvider reference
this.meshContentProvider = meshContentProvider;
if (contentProvider is MeshContentProvider meshContentProvider)
{
// Store meshContentProvider reference
this.meshContentProvider = meshContentProvider;
// Schedule work
this.ScheduleRaytraceOperation();
}
else
{
// Show processing image
this.SetItemThumbnail(theme.GeneratingThumbnailIcon);
// Ask the provider for a content specific thumbnail
thumbnail = await contentProvider.GetThumbnail(libraryItem, thumbWidth, thumbHeight);
}
}
}
if (thumbnail == null)
{
// Use the listview defaults
thumbnail = ((libraryItem is ILibraryContainerLink) ? defaultFolderIcon : defaultItemIcon).AlphaToPrimaryAccent();
}
this.SetItemThumbnail(thumbnail);
// Schedule work
this.ScheduleRaytraceOperation();
},
listViewItem.Model,
listViewItem.Container,
this.thumbWidth,
this.thumbHeight,
theme);
}
private void ScheduleRaytraceOperation()
@ -227,36 +182,14 @@ namespace MatterHackers.MatterControl.CustomWidgets
protected void SetItemThumbnail(ImageBuffer thumbnail)
{
if (thumbnail != null)
if (thumbnail != null
&& this.imageWidget != null
&& (this.imageWidget.Image == null
|| !thumbnail.Equals(this.imageWidget.Image, 5)))
{
// Resize canvas to target as fallback
if (thumbnail.Width < thumbWidth || thumbnail.Height < thumbHeight)
{
thumbnail = ListView.ResizeCanvas(thumbnail, thumbWidth, thumbHeight);
}
else if (thumbnail.Width > thumbWidth || thumbnail.Height > thumbHeight)
{
thumbnail = LibraryProviderHelpers.ResizeImage(thumbnail, thumbWidth, thumbHeight);
}
if (GuiWidget.DeviceScale != 1)
{
thumbnail = thumbnail.CreateScaledImage(GuiWidget.DeviceScale);
}
// TODO: Resolve and implement
// Allow the container to draw an overlay - use signal interface or add method to interface?
//var iconWithOverlay = ActiveContainer.DrawOverlay()
if (thumbnail != null
&& this.imageWidget != null
&& (this.imageWidget.Image == null
|| !thumbnail.Equals(this.imageWidget.Image, 5)))
{
this.imageWidget.Image = thumbnail;
this.ImageSet?.Invoke(this, null);
this.Invalidate();
}
this.imageWidget.Image = thumbnail;
this.ImageSet?.Invoke(this, null);
this.Invalidate();
}
}