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Make a backup of the area an overlay will occupy and restore it afterwards

This commit is contained in:
Daniel Schulte 2020-11-22 18:10:39 +01:00
parent 89f0c26484
commit 1f64677fcf
1 changed files with 21 additions and 0 deletions
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21
tui.cpp
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@ -124,6 +124,24 @@ static void resolve_align(const Align align, const int width, const int height,
y = ymax - height;
}
class surface_backup
{
int x, y;
int w, h;
termpaint_surface *backup;
public:
surface_backup(int x, int y, int w, int h): x(x), y(y), w(w), h(h), backup(termpaint_surface_new_surface(surface, w, h))
{
termpaint_surface_copy_rect(surface, x, y, w, h, backup, 0, 0, TERMPAINT_COPY_NO_TILE, TERMPAINT_COPY_NO_TILE);
}
~surface_backup()
{
termpaint_surface_copy_rect(backup, 0, 0, w, h, surface, x, y, TERMPAINT_COPY_NO_TILE, TERMPAINT_COPY_NO_TILE);
termpaint_surface_free(backup);
}
};
static void draw_box_with_caption(int x, int y, int w, int h, const std::string &caption=std::string())
{
termpaint_surface_clear_rect(surface, x, y, w, h, TERMPAINT_DEFAULT_COLOR, TERMPAINT_DEFAULT_COLOR);
@ -172,6 +190,7 @@ int get_selection(const std::string &caption, const std::vector<std::string> &en
int x, y;
resolve_align(align, cols_needed, rows_needed, 0, cols, 0, rows, x, y);
surface_backup backup(x, y, cols_needed, rows_needed);
draw_box_with_caption(x, y, cols_needed, rows_needed, caption);
int yy = y+1;
@ -230,6 +249,7 @@ std::string get_string(const std::string &caption, const std::string &text, cons
int x, y;
resolve_align(align, cols_needed, rows_needed, 0, cols, 0, rows, x, y);
surface_backup backup(x, y, cols_needed, rows_needed);
const int input_row = y + 1 + !text.empty();
@ -373,6 +393,7 @@ Button message_box(const std::string &caption, const std::string &text, const Bu
const size_t rows = termpaint_surface_height(surface);
int x, y;
resolve_align(align, cols_needed, rows_needed, 0, cols, 0, rows, x, y);
surface_backup backup(x, y, cols_needed, rows_needed);
draw_box_with_caption(x, y, cols_needed, rows_needed, caption);