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.pragma library
function getFirstItemIndex(flatModel) {
for (var i = 0; i < flatModel.length; i++) {
if (!flatModel[i].isHeader)
return i;
}
return 0;
}
function findNextNonHeaderIndex(flatModel, startIndex) {
for (var i = startIndex; i < flatModel.length; i++) {
if (!flatModel[i].isHeader)
return i;
}
return -1;
}
function findPrevNonHeaderIndex(flatModel, startIndex) {
for (var i = startIndex; i >= 0; i--) {
if (!flatModel[i].isHeader)
return i;
}
return -1;
}
function getSectionBounds(flatModel, sectionId) {
if (flatModel._sectionBounds && flatModel._sectionBounds[sectionId])
return flatModel._sectionBounds[sectionId];
var start = -1, end = -1;
for (var i = 0; i < flatModel.length; i++) {
if (flatModel[i].isHeader && flatModel[i].section?.id === sectionId) {
start = i + 1;
} else if (start >= 0 && !flatModel[i].isHeader && flatModel[i].sectionId === sectionId) {
end = i;
} else if (start >= 0 && end >= 0 && flatModel[i].sectionId !== sectionId) {
break;
}
}
return {
start: start,
end: end,
count: end >= start ? end - start + 1 : 0
};
}
function getGridColumns(viewMode, gridColumns) {
switch (viewMode) {
case "tile":
return 3;
case "grid":
return gridColumns;
default:
return 1;
}
}
function calculateNextIndex(flatModel, selectedFlatIndex, sectionId, viewMode, gridColumns, getSectionViewModeFn) {
if (flatModel.length === 0)
return selectedFlatIndex;
var entry = flatModel[selectedFlatIndex];
if (!entry || entry.isHeader) {
var next = findNextNonHeaderIndex(flatModel, selectedFlatIndex + 1);
return next !== -1 ? next : selectedFlatIndex;
}
var actualViewMode = viewMode || getSectionViewModeFn(entry.sectionId);
if (actualViewMode === "list") {
var next = findNextNonHeaderIndex(flatModel, selectedFlatIndex + 1);
return next !== -1 ? next : selectedFlatIndex;
}
var bounds = getSectionBounds(flatModel, entry.sectionId);
var cols = getGridColumns(actualViewMode, gridColumns);
var posInSection = selectedFlatIndex - bounds.start;
var newPosInSection = posInSection + cols;
if (newPosInSection < bounds.count) {
return bounds.start + newPosInSection;
}
var currentRow = Math.floor(posInSection / cols);
var lastRow = Math.floor((bounds.count - 1) / cols);
if (currentRow < lastRow) {
return bounds.start + bounds.count - 1;
}
var nextSection = findNextNonHeaderIndex(flatModel, bounds.end + 1);
return nextSection !== -1 ? nextSection : selectedFlatIndex;
}
function calculatePrevIndex(flatModel, selectedFlatIndex, sectionId, viewMode, gridColumns, getSectionViewModeFn) {
if (flatModel.length === 0)
return selectedFlatIndex;
var entry = flatModel[selectedFlatIndex];
if (!entry || entry.isHeader) {
var prev = findPrevNonHeaderIndex(flatModel, selectedFlatIndex - 1);
return prev !== -1 ? prev : selectedFlatIndex;
}
var actualViewMode = viewMode || getSectionViewModeFn(entry.sectionId);
if (actualViewMode === "list") {
var prev = findPrevNonHeaderIndex(flatModel, selectedFlatIndex - 1);
return prev !== -1 ? prev : selectedFlatIndex;
}
var bounds = getSectionBounds(flatModel, entry.sectionId);
var cols = getGridColumns(actualViewMode, gridColumns);
var posInSection = selectedFlatIndex - bounds.start;
var newPosInSection = posInSection - cols;
if (newPosInSection >= 0) {
return bounds.start + newPosInSection;
}
var prevItem = findPrevNonHeaderIndex(flatModel, bounds.start - 1);
return prevItem !== -1 ? prevItem : selectedFlatIndex;
}
function calculateRightIndex(flatModel, selectedFlatIndex, getSectionViewModeFn) {
if (flatModel.length === 0)
return selectedFlatIndex;
var entry = flatModel[selectedFlatIndex];
if (!entry || entry.isHeader) {
var next = findNextNonHeaderIndex(flatModel, selectedFlatIndex + 1);
return next !== -1 ? next : selectedFlatIndex;
}
var viewMode = getSectionViewModeFn(entry.sectionId);
if (viewMode === "list") {
var next = findNextNonHeaderIndex(flatModel, selectedFlatIndex + 1);
return next !== -1 ? next : selectedFlatIndex;
}
var bounds = getSectionBounds(flatModel, entry.sectionId);
var posInSection = selectedFlatIndex - bounds.start;
if (posInSection + 1 < bounds.count) {
return bounds.start + posInSection + 1;
}
return selectedFlatIndex;
}
function calculateLeftIndex(flatModel, selectedFlatIndex, getSectionViewModeFn) {
if (flatModel.length === 0)
return selectedFlatIndex;
var entry = flatModel[selectedFlatIndex];
if (!entry || entry.isHeader) {
var prev = findPrevNonHeaderIndex(flatModel, selectedFlatIndex - 1);
return prev !== -1 ? prev : selectedFlatIndex;
}
var viewMode = getSectionViewModeFn(entry.sectionId);
if (viewMode === "list") {
var prev = findPrevNonHeaderIndex(flatModel, selectedFlatIndex - 1);
return prev !== -1 ? prev : selectedFlatIndex;
}
var bounds = getSectionBounds(flatModel, entry.sectionId);
var posInSection = selectedFlatIndex - bounds.start;
if (posInSection > 0) {
return bounds.start + posInSection - 1;
}
return selectedFlatIndex;
}
function calculateNextSectionIndex(flatModel, selectedFlatIndex) {
var currentSection = null;
if (selectedFlatIndex >= 0 && selectedFlatIndex < flatModel.length) {
currentSection = flatModel[selectedFlatIndex].sectionId;
}
var foundCurrent = false;
for (var i = 0; i < flatModel.length; i++) {
if (flatModel[i].isHeader) {
if (foundCurrent) {
for (var j = i + 1; j < flatModel.length; j++) {
if (!flatModel[j].isHeader)
return j;
}
}
if (flatModel[i].section.id === currentSection) {
foundCurrent = true;
}
}
}
return selectedFlatIndex;
}
function calculatePrevSectionIndex(flatModel, selectedFlatIndex) {
var currentSection = null;
if (selectedFlatIndex >= 0 && selectedFlatIndex < flatModel.length) {
currentSection = flatModel[selectedFlatIndex].sectionId;
}
var lastSectionStart = -1;
var prevSectionStart = -1;
for (var i = 0; i < flatModel.length; i++) {
if (flatModel[i].isHeader) {
if (flatModel[i].section.id === currentSection) {
break;
}
prevSectionStart = lastSectionStart;
lastSectionStart = i;
}
}
if (prevSectionStart >= 0) {
for (var j = prevSectionStart + 1; j < flatModel.length; j++) {
if (!flatModel[j].isHeader)
return j;
}
}
return selectedFlatIndex;
}
function calculatePageDownIndex(flatModel, selectedFlatIndex, visibleItems) {
if (flatModel.length === 0)
return selectedFlatIndex;
var itemsToSkip = visibleItems || 8;
var newIndex = selectedFlatIndex;
for (var i = 0; i < itemsToSkip; i++) {
var next = findNextNonHeaderIndex(flatModel, newIndex + 1);
if (next === -1)
break;
newIndex = next;
}
return newIndex;
}
function calculatePageUpIndex(flatModel, selectedFlatIndex, visibleItems) {
if (flatModel.length === 0)
return selectedFlatIndex;
var itemsToSkip = visibleItems || 8;
var newIndex = selectedFlatIndex;
for (var i = 0; i < itemsToSkip; i++) {
var prev = findPrevNonHeaderIndex(flatModel, newIndex - 1);
if (prev === -1)
break;
newIndex = prev;
}
return newIndex;
}
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