WIP: ToDo widget text highlighting

app/src/main/java/net/gsantner/markor/widget/TodoWidgetRemoteViewsFactory.java

@@ -2,15 +2,23 @@
 
 import android.content.Context;
 import android.content.Intent;
+import android.graphics.Typeface;
+import android.text.Spannable;
+import android.text.SpannableStringBuilder;
+import android.text.style.ForegroundColorSpan;
+import android.text.style.StrikethroughSpan;
+import android.text.style.StyleSpan;
 import android.widget.RemoteViews;
 import android.widget.RemoteViewsService;
 
 import net.gsantner.markor.R;
 import net.gsantner.markor.format.todotxt.TodoTxtTask;
 import net.gsantner.markor.model.AppSettings;
 import net.gsantner.markor.model.Document;
+import net.gsantner.opoc.util.GsContextUtils;
 
 import java.util.ArrayList;
+import java.util.Calendar;
 import java.util.List;
 
 public class TodoWidgetRemoteViewsFactory implements RemoteViewsService.RemoteViewsFactory {
@@ -56,8 +64,8 @@ public int getCount() {
     @Override
     public RemoteViews getViewAt(int position) {
         RemoteViews views = new RemoteViews(_context.getPackageName(), R.layout.todo_widget_list_item);
-        views.setTextViewText(R.id.todo_widget_item_text, _tasks.get(position).getDescription());
-        views.setInt(R.id.todo_widget_item_text, "setTextColor", _appSettings.getEditorForegroundColor());
+
+        views.setTextViewText(R.id.todo_widget_item_text, getTaskSpannable(_tasks.get(position)));
 
         final Intent fillInIntent = new Intent()
                 .putExtra(Document.EXTRA_FILE_LINE_NUMBER, position);
@@ -85,4 +93,84 @@ public long getItemId(int position) {
     public boolean hasStableIds() {
         return false;
     }
+
+    private Spannable getTaskSpannable(TodoTxtTask task) {
+        SpannableStringBuilder spannable = new SpannableStringBuilder();
+        int currentPos = 0;
+        final char priority = task.getPriority();
+        final String dueDate = task.getDueDate();
+        final String description = task.getDescription();
+        final boolean isDone = task.isDone();
+
+        if (priority != TodoTxtTask.PRIORITY_NONE) {
+            spannable.append(String.valueOf(priority));
+            spannable.setSpan(new ForegroundColorSpan(getColorFromPriority(priority)), currentPos, ++currentPos, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
+            spannable.setSpan(new StyleSpan(Typeface.BOLD), 0, currentPos, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
+        }
+        if (!dueDate.isEmpty()) {
+            currentPos = addSpaceIfNecessary(currentPos, spannable);
+            String displayDueDate = Calendar.getInstance().get(Calendar.YEAR) == Integer.parseInt(dueDate.substring(0, 4))
+                    ? dueDate.substring(5) : dueDate;
+            spannable.append(displayDueDate);
+            spannable.setSpan(new ForegroundColorSpan(0xffEF2929), currentPos, currentPos += displayDueDate.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
+            spannable.setSpan(new StyleSpan(Typeface.ITALIC), currentPos - displayDueDate.length(), currentPos, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
+        }
+        if (!description.isEmpty()) {
+            currentPos = addSpaceIfNecessary(currentPos, spannable);
+            spannable.append(description);
+            spannable.setSpan(new ForegroundColorSpan(_appSettings.getEditorForegroundColor()), currentPos, currentPos += description.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
+        }
+        currentPos = appendTags(spannable, task.getProjects(), '+', 0xffef6C00, currentPos);
+        currentPos = appendTags(spannable, task.getContexts(), '@', 0xff88b04b, currentPos);
+        if(isDone){
+            spannable.setSpan(new ForegroundColorSpan(GsContextUtils.instance.isDarkModeEnabled(_appSettings.getContext()) ? 0x999d9d9d : 0x993d3d3d), 0, currentPos, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
+            spannable.setSpan(new StrikethroughSpan(), 0, currentPos, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
+        }
+
+        return spannable;
+    }
+
+    private static int addSpaceIfNecessary(int currentPos, SpannableStringBuilder spannable) {
+        if (currentPos > 0) {
+            spannable.append(" ");
+            currentPos++;
+        }
+        return currentPos;
+    }
+
+    private int appendTags(SpannableStringBuilder spannable, List<String> tags, char prefix, int color, int currentPos) {
+        for (String tag : tags) {
+            currentPos = addSpaceIfNecessary(currentPos, spannable);
+            spannable.append(prefix).append(tag);
+            spannable.setSpan(new ForegroundColorSpan(color), currentPos, currentPos += tag.length() + 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
+        }
+        return currentPos;
+    }
+
+    private int getColorFromPriority(char priority) {
+        final int COLOR_PRIORITY_A = 0xffEF2929;
+        final int COLOR_PRIORITY_B = 0xffd16900;
+        final int COLOR_PRIORITY_C = 0xff59a112;
+        final int COLOR_PRIORITY_D = 0xff0091c2;
+        final int COLOR_PRIORITY_E = 0xffa952cb;
+        final int COLOR_PRIORITY_F = 0xff878986;
+
+        switch (priority)
+        {
+            case 'A':
+                return COLOR_PRIORITY_A;
+            case 'B':
+                return COLOR_PRIORITY_B;
+            case 'C':
+                return COLOR_PRIORITY_C;
+            case 'D':
+                return COLOR_PRIORITY_D;
+            case 'E':
+                return COLOR_PRIORITY_E;
+            case 'F':
+                return COLOR_PRIORITY_F;
+            default:
+                return _appSettings.getEditorForegroundColor();
+        }
+    }
 }