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OpenCanopy: Support basic keyboard-based scrolling

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This commit is contained in:
Marvin Häuser 2021-01-04 22:54:46 +01:00
parent ae65fcceba
commit 0ddb54a6b0
1 changed files with 87 additions and 21 deletions
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108
Platform/OpenCanopy/Views/BootPicker.c
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@ -185,6 +185,39 @@ InternalBootPickerSelectEntry (
Selector->Obj.OffsetX += (VolumeEntryObj->Width - Selector->Obj.Width) / 2;
}
INT64
InternelBootPickerScrollSelected (
IN UINT32 Scale
)
{
CONST GUI_VOLUME_ENTRY *SelectedEntry;
INT64 EntryOffsetX;
INT64 ScrollDelta;
ASSERT (mBootPicker.SelectedEntry != NULL);
//
// If the selected entry is outside of the view, scroll it accordingly.
// This function is called every time an entry is added or changed.
// Due to this internal design, the selected entry can never be outside of the
// view by more than one entry's size.
//
SelectedEntry = mBootPicker.SelectedEntry;
EntryOffsetX = mBootPicker.Hdr.Obj.OffsetX + SelectedEntry->Hdr.Obj.OffsetX;
ScrollDelta = (BOOT_ENTRY_WIDTH + BOOT_ENTRY_SPACE) * Scale;
if (EntryOffsetX < 0) {
mBootPicker.Hdr.Obj.OffsetX += ScrollDelta;
return ScrollDelta;
}
if (EntryOffsetX + SelectedEntry->Hdr.Obj.Width > mBootPickerView.Width) {
mBootPicker.Hdr.Obj.OffsetX -= ScrollDelta;
return -ScrollDelta;
}
return 0;
}
VOID
InternalBootPickerChangeEntry (
IN OUT GUI_VOLUME_PICKER *This,
@ -195,6 +228,9 @@ InternalBootPickerChangeEntry (
)
{
GUI_VOLUME_ENTRY *PrevEntry;
INT64 ScrollOffset;
INT64 DrawX;
UINT32 DrawWidth;
ASSERT (This != NULL);
ASSERT (DrawContext != NULL);
@ -211,28 +247,54 @@ InternalBootPickerChangeEntry (
PrevEntry = This->SelectedEntry;
InternalBootPickerSelectEntry (This, NewEntry);
//
// To redraw the entry *and* the selector, draw the entire height of the
// Picker object. For this, the height just reach from the top of the entries
// to the bottom of the selector.
//
GuiDrawScreen (
DrawContext,
BaseX + NewEntry->Hdr.Obj.OffsetX,
BaseY + NewEntry->Hdr.Obj.OffsetY,
NewEntry->Hdr.Obj.Width,
This->Hdr.Obj.Height,
TRUE
);
ScrollOffset = InternelBootPickerScrollSelected (DrawContext->Scale);
if (ScrollOffset == 0) {
//
// To redraw the entry *and* the selector, draw the entire height of the
// Picker object. For this, the height just reach from the top of the entries
// to the bottom of the selector.
//
GuiDrawScreen (
DrawContext,
BaseX + NewEntry->Hdr.Obj.OffsetX,
BaseY + NewEntry->Hdr.Obj.OffsetY,
NewEntry->Hdr.Obj.Width,
This->Hdr.Obj.Height,
TRUE
);
GuiDrawScreen (
DrawContext,
BaseX + PrevEntry->Hdr.Obj.OffsetX,
BaseY + PrevEntry->Hdr.Obj.OffsetY,
PrevEntry->Hdr.Obj.Width,
This->Hdr.Obj.Height,
TRUE
);
GuiDrawScreen (
DrawContext,
BaseX + PrevEntry->Hdr.Obj.OffsetX,
BaseY + PrevEntry->Hdr.Obj.OffsetY,
PrevEntry->Hdr.Obj.Width,
This->Hdr.Obj.Height,
TRUE
);
} else {
//
// The X coordinate of the view changed by scrolling, so adjust it.
// The entire view plus an entry prior or following need to be drawn.
//
if (ScrollOffset < 0) {
DrawX = BaseX + ScrollOffset;
DrawWidth = (UINT32) (This->Hdr.Obj.Width - ScrollOffset);
} else {
DrawX = BaseX;
DrawWidth = (UINT32) (This->Hdr.Obj.Width + ScrollOffset);
}
//
// The entry list has been scrolled, redraw the entire view.
//
GuiDrawScreen (
DrawContext,
DrawX,
BaseY,
DrawWidth,
This->Hdr.Obj.Height,
TRUE
);
}
//
// Set voice timeout to N frames from now.
@ -969,6 +1031,10 @@ BootPickerEntriesAdd (
GuiContext->BootEntry = Entry;
}
if (mBootPicker.SelectedEntry != NULL) {
InternelBootPickerScrollSelected (GuiContext->Scale);
}
return EFI_SUCCESS;
}