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Cleaned up and added asserts to Scrollbar.cpp

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This commit is contained in:
Casey Langen 2019-01-08 22:04:40 -08:00
parent 141a8d20d8
commit d2f307fbbb
1 changed files with 32 additions and 32 deletions
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64
src/musikcube/cursespp/Scrollbar.cpp
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@ -39,44 +39,44 @@
using namespace cursespp;
void Scrollbar::Draw(ListWindow* list, Window* target) {
int height = list->GetHeight();
auto *adapter = &list->GetScrollAdapter();
if (adapter && height > 2) {
auto& pos = list->GetScrollPosition();
if (adapter) {
target = (target == nullptr) ? list : target;
/* these are defaults for drawing to an external view, that
is, when target != list. */
int xOffset = 0;
int from = 0, to = height;
WINDOW* frame = nullptr;
float range = (float) height;
size_t minY = 0;
int trackHeight = target->GetHeight();
if (!target || target == list) {
/* if we're drawing on top of the ListWindow's frame,
we need to account for the padding it provides. */
frame = list->GetFrame();
xOffset = list->GetWidth() - 1;
++from; --to;
range -= 2.0f;
minY = 1;
}
else {
frame = target->GetFrame();
if (target->IsFrameVisible()) {
trackHeight -= 2; /* account for border */
}
float total = (float) std::max(minY, adapter->GetEntryCount());
if (trackHeight > 1) {
auto& pos = list->GetScrollPosition();
WINDOW* window = target->GetFrame();
size_t itemCount = adapter->GetEntryCount();
int yOffset;
if (range >= total) {
yOffset = -1;
}
else {
float percent = (float) pos.logicalIndex / total;
yOffset = (int) (range * percent) + minY;
}
/* track */
int trackX = target->GetWidth() - 1;
int trackMinY = target->IsFrameVisible() ? 1 : 0;
int trackMaxY = trackMinY + trackHeight;
mvwvline(frame, from, xOffset, 0, to - from);
mvwaddch(frame, yOffset, xOffset, ' ' | A_REVERSE);
/* thumb */
int thumbY = -1;
if (itemCount > trackHeight) {
float percent = (float) pos.logicalIndex / (float) itemCount;
thumbY = (int) ((float) trackHeight * percent) + trackMinY;
}
/* validate */
assert(trackMinY >= 0);
assert(trackMaxY <= target->GetHeight());
assert(trackMaxY > trackMinY);
assert(trackHeight <= target->GetHeight());
/* draw */
mvwvline(window, trackMinY, trackX, 0, trackHeight); /* track */
if (thumbY >= trackMinY && thumbY < trackMaxY) {
mvwaddch(window, thumbY, trackX, ' ' | A_REVERSE); /* handle */
}
}
}
}