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sel: refactor backtracking 

Signed-off-by: Varun Patil <radialapps@gmail.com>
pull/953/head
Varun Patil 2023-11-26 18:51:59 -08:00
parent 0250b27bdf
commit 366c6dc5e2
1 changed files with 53 additions and 33 deletions
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86
src/components/SelectionManager.vue
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@ -652,53 +652,73 @@ export default defineComponent({
const pIdx = pRow.photos?.indexOf(photo) ?? -1;
if (pIdx === -1) return;
const updateDaySet = new Set<number>();
let behind: IPhoto[] = [];
let behindFound = false;
/**
* @brief Look behind for a selected photo.
* @returns the list of photos behind the current photo upto
* the first selected photo.
* @returns null if no selected photo is found.
*/
const lookBehind = (): IPhoto[] | undefined => {
const result: IPhoto[] = [];
for (let i = rowIdx; i >= Math.max(rowIdx - 1000, 0); i--) {
const row = rows[i];
if (row.type !== 1) continue; // skip non-photo rows
// Look behind
for (let i = rowIdx; i > rowIdx - 100; i--) {
if (i < 0) break;
if (rows[i].type !== 1) continue;
if (!rows[i].photos?.length) break;
// Give up if unloaded rows are found
if (!row.photos?.length) break;
const sj = i === rowIdx ? pIdx : rows[i].photos!.length - 1;
for (let j = sj; j >= 0; j--) {
const p = rows[i].photos![j];
if (p.flag & this.c.FLAG_PLACEHOLDER || !p.fileid) continue;
if (p.flag & this.c.FLAG_SELECTED) {
behindFound = true;
break;
// Iterate photos in this row from the end
const sj = i === rowIdx ? pIdx : row.photos.length - 1;
for (let j = sj; j >= 0; j--) {
const p = row.photos[j];
if (p.flag & this.c.FLAG_PLACEHOLDER || !p.fileid) continue;
if (p.flag & this.c.FLAG_SELECTED) {
// Found a selected photo, return everything excluding this
return result;
}
result.push(p);
}
behind.push(p);
updateDaySet.add(p.dayid);
}
};
if (behindFound) break;
}
// Set of dayIds to update
const touchedDays = new Set<number>();
// Select everything behind
if (behindFound) {
const detail = photo.d!.detail!;
const behind = lookBehind();
if (behind) {
// Clear everything in front in this day
const detail = photo.d!.detail!;
const pdIdx = detail.indexOf(photo);
for (let i = pdIdx + 1; i < detail.length; i++) {
if (detail[i].flag & this.c.FLAG_SELECTED) this.selectPhoto(detail[i], false, true);
if (detail[i].flag & this.c.FLAG_SELECTED) {
this.selectPhoto(detail[i], false, true);
}
}
// Clear everything else in front
Array.from(this.selection.values())
.filter((p: IPhoto) => (this.isreverse ? p.dayid > photo.dayid : p.dayid < photo.dayid))
.forEach((photo: IPhoto) => {
this.selectPhoto(photo, false, true);
updateDaySet.add(photo.dayid);
});
// De-select everything else in front (other days)
for (const [_, p] of this.selection) {
if (this.isreverse ? p.dayid > photo.dayid : p.dayid < photo.dayid) {
this.selectPhoto(p, false, true);
touchedDays.add(p.dayid);
}
}
behind.forEach((p) => this.selectPhoto(p, true, true));
updateDaySet.forEach((dayid) => this.updateHeadSelected(this.heads.get(dayid)!));
this.$forceUpdate();
// Select everything behind upto the selected photo
for (const p of behind) {
this.selectPhoto(p, true, true);
touchedDays.add(p.dayid);
}
}
// Force update for all days that were touched
for (const dayid of touchedDays) {
this.updateHeadSelected(this.heads.get(dayid)!);
}
this.$forceUpdate();
},
/** Select or deselect all photos in a head */