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Make label sizing algorithm more robust

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This commit is contained in:
Pedro J. Estébanez 2023-02-15 08:57:22 +01:00
parent 8c7b98d452
commit 4f7f1ef60b
2 changed files with 137 additions and 130 deletions
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81
scene/gui/label.cpp
View file

@ -86,9 +86,7 @@ int Label::get_line_height(int p_line) const {
}
}
void Label::_shape() {
bool font_was_dirty = font_dirty;
bool Label::_shape() {
Ref<StyleBox> style = theme_cache.normal_style;
int width = (get_size().width - style->get_minimum_size().width);
@ -103,7 +101,7 @@ void Label::_shape() {
}
const Ref<Font> &font = (settings.is_valid() && settings->get_font().is_valid()) ? settings->get_font() : theme_cache.font;
int font_size = settings.is_valid() ? settings->get_font_size() : theme_cache.font_size;
ERR_FAIL_COND(font.is_null());
ERR_FAIL_COND_V(font.is_null(), true);
String txt = (uppercase) ? TS->string_to_upper(xl_text, language) : xl_text;
if (visible_chars >= 0 && visible_chars_behavior == TextServer::VC_CHARS_BEFORE_SHAPING) {
txt = txt.substr(0, visible_chars);
@ -123,6 +121,7 @@ void Label::_shape() {
dirty = false;
font_dirty = false;
lines_dirty = true;
// Note for future maintainers: forgetting stable width here (e.g., setting it to -1) may fix still undiscovered bugs.
}
if (lines_dirty) {
@ -135,19 +134,20 @@ void Label::_shape() {
Size2i prev_minsize = minsize;
minsize = Size2();
bool can_process_lines = false;
if (xl_text.length() == 0) {
can_process_lines = true;
lines_dirty = false;
return;
}
} else {
// With autowrap on, we won't compute the minimum size until width is stable (two shape requests in a
// row with the same width.) This avoids situations in which the initial width is very narrow and the label
// would break text into many very short lines, causing a very tall label that can leave a deformed container.
// Don't compute minimum size until width is stable (two shape requests in a row with the same width.)
// This avoids situations in which the initial width is very narrow and the label would break text
// into many very short lines, causing a very tall label that can leave a deformed container.
bool width_stabilized = get_size().width == stable_width;
can_process_lines = get_size().width == stable_width || autowrap_mode == TextServer::AUTOWRAP_OFF;
stable_width = get_size().width;
// With autowrap off, there's still a point in shaping before width is stable: to contribute a min width.
if (lines_dirty && (width_stabilized || autowrap_mode == TextServer::AUTOWRAP_OFF)) {
if (can_process_lines) {
if (lines_dirty) {
BitField<TextServer::LineBreakFlag> autowrap_flags = TextServer::BREAK_MANDATORY;
switch (autowrap_mode) {
case TextServer::AUTOWRAP_WORD_SMART:
@ -180,10 +180,9 @@ void Label::_shape() {
// With autowrap off, by now we already know the width the label will take.
width = (minsize.width - style->get_minimum_size().width);
width_stabilized = true;
}
if (lines_dirty && width_stabilized) {
if (lines_dirty) {
BitField<TextServer::TextOverrunFlag> overrun_flags = TextServer::OVERRUN_NO_TRIM;
switch (overrun_behavior) {
case TextServer::OVERRUN_TRIM_WORD_ELLIPSIS:
@ -250,14 +249,21 @@ void Label::_shape() {
lines_dirty = false;
}
} else {
callable_mp(this, &Label::_shape).call_deferred();
}
}
if (minsize != prev_minsize || font_was_dirty) {
if (draw_pending) {
queue_redraw();
draw_pending = false;
}
if (minsize != prev_minsize) {
update_minimum_size();
}
if (!width_stabilized) {
callable_mp(this, &Label::_shape).call_deferred();
}
return can_process_lines;
}
inline void draw_glyph(const Glyph &p_gl, const RID &p_canvas, const Color &p_font_color, const Vector2 &p_ofs) {
@ -367,10 +373,9 @@ void Label::_notification(int p_what) {
}
if (dirty || font_dirty || lines_dirty) {
_shape();
if (lines_dirty) {
if (!_shape()) {
// There will be another pass.
queue_redraw();
draw_pending = true;
break;
}
}
@ -396,7 +401,7 @@ void Label::_notification(int p_what) {
style->draw(ci, Rect2(Point2(0, 0), get_size()));
float total_h = 0.0;
int visible_lines = 0;
int lines_visible = 0;
// Get number of lines to fit to the height.
for (int64_t i = lines_skipped; i < lines_rid.size(); i++) {
@ -404,14 +409,14 @@ void Label::_notification(int p_what) {
if (total_h > (get_size().height - style->get_minimum_size().height + line_spacing)) {
break;
}
visible_lines++;
lines_visible++;
}
if (max_lines_visible >= 0 && visible_lines > max_lines_visible) {
visible_lines = max_lines_visible;
if (max_lines_visible >= 0 && lines_visible > max_lines_visible) {
lines_visible = max_lines_visible;
}
int last_line = MIN(lines_rid.size(), visible_lines + lines_skipped);
int last_line = MIN(lines_rid.size(), lines_visible + lines_skipped);
bool trim_chars = (visible_chars >= 0) && (visible_chars_behavior == TextServer::VC_CHARS_AFTER_SHAPING);
bool trim_glyphs_ltr = (visible_chars >= 0) && ((visible_chars_behavior == TextServer::VC_GLYPHS_LTR) || ((visible_chars_behavior == TextServer::VC_GLYPHS_AUTO) && !rtl_layout));
bool trim_glyphs_rtl = (visible_chars >= 0) && ((visible_chars_behavior == TextServer::VC_GLYPHS_RTL) || ((visible_chars_behavior == TextServer::VC_GLYPHS_AUTO) && rtl_layout));
@ -428,7 +433,7 @@ void Label::_notification(int p_what) {
total_h += style->get_margin(SIDE_TOP) + style->get_margin(SIDE_BOTTOM);
int vbegin = 0, vsep = 0;
if (visible_lines > 0) {
if (lines_visible > 0) {
switch (vertical_alignment) {
case VERTICAL_ALIGNMENT_TOP: {
// Nothing.
@ -445,8 +450,8 @@ void Label::_notification(int p_what) {
} break;
case VERTICAL_ALIGNMENT_FILL: {
vbegin = 0;
if (visible_lines > 1) {
vsep = (size.y - (total_h - line_spacing)) / (visible_lines - 1);
if (lines_visible > 1) {
vsep = (size.y - (total_h - line_spacing)) / (lines_visible - 1);
} else {
vsep = 0;
}
@ -615,6 +620,8 @@ void Label::_notification(int p_what) {
}
ofs.y += TS->shaped_text_get_descent(lines_rid[i]) + vsep + line_spacing;
}
draw_pending = false;
} break;
case NOTIFICATION_THEME_CHANGED: {
@ -666,25 +673,25 @@ int Label::get_line_count() const {
int Label::get_visible_line_count() const {
Ref<StyleBox> style = theme_cache.normal_style;
int line_spacing = settings.is_valid() ? settings->get_line_spacing() : theme_cache.line_spacing;
int visible_lines = 0;
int lines_visible = 0;
float total_h = 0.0;
for (int64_t i = lines_skipped; i < lines_rid.size(); i++) {
total_h += TS->shaped_text_get_size(lines_rid[i]).y + line_spacing;
if (total_h > (get_size().height - style->get_minimum_size().height + line_spacing)) {
break;
}
visible_lines++;
lines_visible++;
}
if (visible_lines > lines_rid.size()) {
visible_lines = lines_rid.size();
if (lines_visible > lines_rid.size()) {
lines_visible = lines_rid.size();
}
if (max_lines_visible >= 0 && visible_lines > max_lines_visible) {
visible_lines = max_lines_visible;
if (max_lines_visible >= 0 && lines_visible > max_lines_visible) {
lines_visible = max_lines_visible;
}
return visible_lines;
return lines_visible;
}
void Label::set_horizontal_alignment(HorizontalAlignment p_alignment) {
@ -969,7 +976,7 @@ void Label::_bind_methods() {
ClassDB::bind_method(D_METHOD("get_visible_ratio"), &Label::get_visible_ratio);
ClassDB::bind_method(D_METHOD("set_lines_skipped", "lines_skipped"), &Label::set_lines_skipped);
ClassDB::bind_method(D_METHOD("get_lines_skipped"), &Label::get_lines_skipped);
ClassDB::bind_method(D_METHOD("set_max_lines_visible", "visible_lines"), &Label::set_max_lines_visible);
ClassDB::bind_method(D_METHOD("set_max_lines_visible", "lines_visible"), &Label::set_max_lines_visible);
ClassDB::bind_method(D_METHOD("get_max_lines_visible"), &Label::get_max_lines_visible);
ClassDB::bind_method(D_METHOD("set_structured_text_bidi_override", "parser"), &Label::set_structured_text_bidi_override);
ClassDB::bind_method(D_METHOD("get_structured_text_bidi_override"), &Label::get_structured_text_bidi_override);

4
scene/gui/label.h
View file

@ -50,7 +50,6 @@ private:
bool uppercase = false;
bool lines_dirty = true;
bool dirty = true;
bool font_dirty = true;
RID text_rid;
@ -66,6 +65,7 @@ private:
float visible_ratio = 1.0;
int lines_skipped = 0;
int max_lines_visible = -1;
bool draw_pending = false;
Ref<LabelSettings> settings;
@ -83,7 +83,7 @@ private:
int font_shadow_outline_size;
} theme_cache;
void _shape();
bool _shape();
void _invalidate();
protected: