63 lines
2.7 KiB
C++
63 lines
2.7 KiB
C++
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#include "ManyElementScrollArea.hpp"
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#include "../GUIManager.hpp"
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namespace GUIStuff {
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ManyElementScrollArea::ManyElementScrollArea(GUIManager& gui): Element(gui) {}
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void ManyElementScrollArea::layout(const Clay_ElementId& id, const Options& opts) {
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options = opts;
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CLAY(id, {
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.layout = {.sizing = {.width = CLAY_SIZING_GROW(0), .height = CLAY_SIZING_GROW(0)}}
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}) {
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if(boundingBox.has_value()) {
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scrollArea = gui.clipping_element<ScrollArea>("scroll area", ScrollArea::Options{
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.scrollVertical = true,
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.clipHorizontal = options.clipHorizontal,
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.clipVertical = true,
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.scrollbarY = options.scrollbar,
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.xAlign = options.xAlign,
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.yAlign = CLAY_ALIGN_Y_TOP,
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.innerContent = [&](const ScrollArea::InnerContentParameters& params) {
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if(options.innerContentExtraCallback) options.innerContentExtraCallback(params);
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float absScrollAmount = std::fabs(params.scrollOffset->y());
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size_t startPoint = absScrollAmount / options.entryHeight;
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size_t elementsContainable = (boundingBox.value().height() / options.entryHeight) + 2; // Displaying 2 more elements ensures that there isn't any empty space in the container
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size_t endPoint = std::min(options.entryCount, startPoint + elementsContainable);
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if(startPoint != 0) {
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CLAY_AUTO_ID({
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.layout = {
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.sizing = {.width = CLAY_SIZING_GROW(0), .height = CLAY_SIZING_FIXED(startPoint * options.entryHeight)},
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}
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}) { }
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}
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gui.new_id("many element list", [&] {
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for(size_t i = startPoint; i < endPoint; i++) {
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gui.new_id(i - startPoint, [&] {
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CLAY_AUTO_ID({
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.layout = { .sizing = {.width = options.xElementSize, .height = CLAY_SIZING_FIXED(options.entryHeight)}}
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}) {
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options.elementContent(i);
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}
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});
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}
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});
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if(endPoint != options.entryCount) {
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CLAY_AUTO_ID({
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.layout = {
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.sizing = {.width = CLAY_SIZING_GROW(0), .height = CLAY_SIZING_FIXED((options.entryCount - endPoint) * options.entryHeight)},
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}
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}) { }
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}
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}
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});
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}
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}
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}
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}
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