Improvements to progress dialogs

frontend/src/lib/progress.js

@@ -4,12 +4,23 @@ let taskCounter = 0;
 
 export function startProgress(taskDescription = 'Loading…') {
   const taskIndex = ++taskCounter;
-  StartProgressBar(taskIndex, taskDescription);
+  let started = false;
+
+  const debouncer = setTimeout(() => {
+    StartProgressBar(taskIndex, taskDescription);
+    started = true;
+  }, 150);
 
   const task = {
     id: taskIndex,
     description: taskDescription,
-    end: () => StopProgressBar(taskIndex),
+
+    end: () => {
+      clearTimeout(debouncer);
+      if (started) {
+        StopProgressBar(taskIndex);
+      }
+    },
   };
 
   return task;

frontend/src/organisms/connection/collection/find.svelte

@@ -35,6 +35,7 @@
   let queryToSave;
   let showQueryChooser = false;
   let exportInfo;
+  let querying = false;
 
   $: viewsForCollection = views.forCollection(collection.hostKey, collection.dbKey, collection.key);
   $: code = `db.${collection.key}.find(${form.query || '{}'}${form.fields && form.fields !== '{}' ? `, ${form.fields}` : ''}).sort(${form.sort})${form.skip ? `.skip(${form.skip})` : ''}${form.limit ? `.limit(${form.limit})` : ''};`;
@@ -42,16 +43,24 @@
   $: activePage = (submittedForm.limit && submittedForm.skip && result?.results?.length) ? submittedForm.skip / submittedForm.limit : 0;
 
   async function submitQuery() {
+    if (querying) {
+      return;
+    }
+
+    querying = true;
     const progress = startProgress('Performing query…');
     activePath = [];
     const newResult = await FindItems(collection.hostKey, collection.dbKey, collection.key, JSON.stringify(form));
+
     if (newResult) {
       newResult.results = newResult.results?.map(s => EJSON.parse(s, { relaxed: false }));
       result = newResult;
       submittedForm = deepClone(form);
     }
+
     progress.end();
     resetFocus();
+    querying = false;
   }
 
   async function refresh() {

internal/ui/progress.go

@@ -6,6 +6,7 @@ import (
 	"github.com/ncruces/zenity"
 )
 
+// @todo: this takes ~0.5 seconds. Improve?
 func (u *UI) StartProgressBar(id uint, title string) {
 	if title == "" {
 		// default title
@@ -20,13 +21,13 @@ func (u *UI) StartProgressBar(id uint, title string) {
 
 func (u *UI) StopProgressBar(id uint) {
 	for try := 0; try < 10; try++ {
-		p := u.progressBars[id]
+		if p := u.progressBars[id]; p != nil {
-		if p != nil {
 			p.Complete()
 			p.Close()
 			p = nil
 			return
 		}
+
 		println("Progress dialog not found:", id, try)
 		time.Sleep(100 * time.Millisecond)
 	}