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DragFloat, SliderFloat: Rounding scalar using the provided format string instead of parsed precision. (#648)

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This commit is contained in:
omar
2018-04-30 16:44:57 +02:00
parent 6881d065b8
commit 92f0165f85
3 changed files with 45 additions and 46 deletions
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83
imgui.cpp
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@@ -8586,6 +8586,19 @@ bool ImGui::InputScalarAsWidgetReplacement(const ImRect& bb, ImGuiID id, const c
return false;
}
const char* ImGui::ParseFormatTrimDecorationsLeading(const char* fmt)
{
while (char c = fmt[0])
{
if (c == '%' && fmt[1] != '%')
return fmt;
else if (c == '%')
fmt++;
fmt++;
}
return fmt;
}
// Extract the format out of a format string with leading or trailing decorations
// fmt = "blah blah" -> return fmt
// fmt = "%.3f" -> return fmt
@@ -8594,25 +8607,21 @@ bool ImGui::InputScalarAsWidgetReplacement(const ImRect& bb, ImGuiID id, const c
const char* ImGui::ParseFormatTrimDecorations(const char* fmt, char* buf, int buf_size)
{
// We don't use strchr() because our strings are usually very short and often start with '%'
const char* fmt_start = fmt;
const char* fmt_start = ParseFormatTrimDecorationsLeading(fmt);
if (fmt_start[0] != '%')
return fmt;
fmt = fmt_start;
while (char c = *fmt++)
{
if (c != '%') continue; // Looking for %
if (fmt[0] == '%') { fmt++; continue; } // Ignore "%%"
fmt_start = fmt - 1;
while ((c = *fmt++) != 0)
{
if (c >= 'A' && c <= 'Z' && (c != 'L')) // L is a type modifier, other letters qualify as types aka end of the format
break;
if (c >= 'a' && c <= 'z' && (c != 'h' && c != 'j' && c != 'l' && c != 't' && c != 'w' && c != 'z')) // h/j/l/t/w/z are type modifiers, other letters qualify as types aka end of the format
break;
}
if (fmt[0] == 0) // If we only have leading decoration, we don't need to copy the data.
return fmt_start;
ImStrncpy(buf, fmt_start, ImMin((int)(fmt + 1 - fmt_start), buf_size));
return buf;
if (c >= 'A' && c <= 'Z' && (c != 'L')) // L is a type modifier, other letters qualify as types aka end of the format
break;
if (c >= 'a' && c <= 'z' && (c != 'h' && c != 'j' && c != 'l' && c != 't' && c != 'w' && c != 'z')) // h/j/l/t/w/z are type modifiers, other letters qualify as types aka end of the format
break;
}
return fmt_start;
if (fmt[0] == 0) // If we only have leading decoration, we don't need to copy the data.
return fmt_start;
ImStrncpy(buf, fmt_start, ImMin((int)(fmt + 1 - fmt_start), buf_size));
return buf;
}
// Parse display precision back from the display format string
@@ -8644,22 +8653,11 @@ static float GetMinimumStepAtDecimalPrecision(int decimal_precision)
return (decimal_precision >= 0 && decimal_precision < 10) ? min_steps[decimal_precision] : powf(10.0f, (float)-decimal_precision);
}
float ImGui::RoundScalar(float value, int decimal_precision)
float ImGui::RoundScalarWithFormat(const char* format, float value)
{
// Round past decimal precision
// So when our value is 1.99999 with a precision of 0.001 we'll end up rounding to 2.0
// FIXME: Investigate better rounding methods
if (decimal_precision < 0)
return value;
const float min_step = GetMinimumStepAtDecimalPrecision(decimal_precision);
bool negative = value < 0.0f;
value = fabsf(value);
float remainder = fmodf(value, min_step);
if (remainder <= min_step*0.5f)
value -= remainder;
else
value += (min_step - remainder);
return negative ? -value : value;
char buf[64];
ImFormatString(buf, IM_ARRAYSIZE(buf), ParseFormatTrimDecorationsLeading(format), value);
return (float)atof(buf);
}
static inline float SliderBehaviorCalcRatioFromValue(float v, float v_min, float v_max, float power, float linear_zero_pos)
@@ -8687,7 +8685,7 @@ static inline float SliderBehaviorCalcRatioFromValue(float v, float v_min, float
return (v_clamped - v_min) / (v_max - v_min);
}
bool ImGui::SliderBehavior(const ImRect& frame_bb, ImGuiID id, float* v, float v_min, float v_max, float power, int decimal_precision, ImGuiSliderFlags flags)
bool ImGui::SliderBehavior(const ImRect& frame_bb, ImGuiID id, float* v, float v_min, float v_max, const char* format, float power, ImGuiSliderFlags flags)
{
ImGuiContext& g = *GImGui;
ImGuiWindow* window = GetCurrentWindow();
@@ -8700,11 +8698,12 @@ bool ImGui::SliderBehavior(const ImRect& frame_bb, ImGuiID id, float* v, float v
const bool is_non_linear = (power < 1.0f-0.00001f) || (power > 1.0f+0.00001f);
const bool is_horizontal = (flags & ImGuiSliderFlags_Vertical) == 0;
const bool is_decimal = ParseFormatPrecision(format, 3) > 0;
const float grab_padding = 2.0f;
const float slider_sz = is_horizontal ? (frame_bb.GetWidth() - grab_padding * 2.0f) : (frame_bb.GetHeight() - grab_padding * 2.0f);
float grab_sz;
if (decimal_precision != 0)
if (is_decimal)
grab_sz = ImMin(style.GrabMinSize, slider_sz);
else
grab_sz = ImMin(ImMax(1.0f * (slider_sz / ((v_min < v_max ? v_max - v_min : v_min - v_max) + 1.0f)), style.GrabMinSize), slider_sz); // Integer sliders, if possible have the grab size represent 1 unit
@@ -8759,7 +8758,7 @@ bool ImGui::SliderBehavior(const ImRect& frame_bb, ImGuiID id, float* v, float v
else if (delta != 0.0f)
{
clicked_t = SliderBehaviorCalcRatioFromValue(*v, v_min, v_max, power, linear_zero_pos);
if (decimal_precision == 0 && !is_non_linear)
if (!is_decimal && !is_non_linear)
{
if (fabsf(v_max - v_min) <= 100.0f || IsNavInputDown(ImGuiNavInput_TweakSlow))
delta = ((delta < 0.0f) ? -1.0f : +1.0f) / (v_max - v_min); // Gamepad/keyboard tweak speeds in integer steps
@@ -8814,7 +8813,7 @@ bool ImGui::SliderBehavior(const ImRect& frame_bb, ImGuiID id, float* v, float v
}
// Round past decimal precision
new_value = RoundScalar(new_value, decimal_precision);
new_value = RoundScalarWithFormat(format, new_value);
if (*v != new_value)
{
*v = new_value;
@@ -8868,7 +8867,6 @@ bool ImGui::SliderFloat(const char* label, float* v, float v_min, float v_max, c
if (!format)
format = "%.3f";
int decimal_precision = ParseFormatPrecision(format, 3);
// Tabbing or CTRL-clicking on Slider turns it into an input box
bool start_text_input = false;
@@ -8890,7 +8888,7 @@ bool ImGui::SliderFloat(const char* label, float* v, float v_min, float v_max, c
// Actual slider behavior + render grab
ItemSize(total_bb, style.FramePadding.y);
const bool value_changed = SliderBehavior(frame_bb, id, v, v_min, v_max, power, decimal_precision);
const bool value_changed = SliderBehavior(frame_bb, id, v, v_min, v_max, format, power);
// Display value using user-provided display format so user can add prefix/suffix/decorations to the value.
char value_buf[64];
@@ -8924,7 +8922,6 @@ bool ImGui::VSliderFloat(const char* label, const ImVec2& size, float* v, float
if (!format)
format = "%.3f";
int decimal_precision = ParseFormatPrecision(format, 3);
if ((hovered && g.IO.MouseClicked[0]) || g.NavActivateId == id || g.NavInputId == id)
{
@@ -8935,7 +8932,7 @@ bool ImGui::VSliderFloat(const char* label, const ImVec2& size, float* v, float
}
// Actual slider behavior + render grab
bool value_changed = SliderBehavior(frame_bb, id, v, v_min, v_max, power, decimal_precision, ImGuiSliderFlags_Vertical);
bool value_changed = SliderBehavior(frame_bb, id, v, v_min, v_max, format, power, ImGuiSliderFlags_Vertical);
// Display value using user-provided display format so user can add prefix/suffix/decorations to the value.
// For the vertical slider we allow centered text to overlap the frame padding
@@ -9061,7 +9058,7 @@ bool ImGui::SliderInt4(const char* label, int v[4], int v_min, int v_max, const
return SliderIntN(label, v, 4, v_min, v_max, format);
}
bool ImGui::DragBehavior(const ImRect& frame_bb, ImGuiID id, float* v, float v_speed, float v_min, float v_max, int decimal_precision, float power)
bool ImGui::DragBehavior(const ImRect& frame_bb, ImGuiID id, float* v, float v_speed, float v_min, float v_max, const char* format, float power)
{
ImGuiContext& g = *GImGui;
const ImGuiStyle& style = g.Style;
@@ -9106,6 +9103,7 @@ bool ImGui::DragBehavior(const ImRect& frame_bb, ImGuiID id, float* v, float v_s
}
if (g.ActiveIdSource == ImGuiInputSource_Nav)
{
int decimal_precision = ParseFormatPrecision(format, 3);
adjust_delta = GetNavInputAmount2d(ImGuiNavDirSourceFlags_Keyboard|ImGuiNavDirSourceFlags_PadDPad, ImGuiInputReadMode_RepeatFast, 1.0f/10.0f, 10.0f).x;
v_speed = ImMax(v_speed, GetMinimumStepAtDecimalPrecision(decimal_precision));
}
@@ -9141,7 +9139,7 @@ bool ImGui::DragBehavior(const ImRect& frame_bb, ImGuiID id, float* v, float v_s
// Round to user desired precision, then apply
bool value_changed = false;
v_cur = RoundScalar(v_cur, decimal_precision);
v_cur = RoundScalarWithFormat(format, v_cur);
if (*v != v_cur)
{
*v = v_cur;
@@ -9177,7 +9175,6 @@ bool ImGui::DragFloat(const char* label, float* v, float v_speed, float v_min, f
if (!format)
format = "%.3f";
int decimal_precision = ParseFormatPrecision(format, 3);
// Tabbing or CTRL-clicking on Drag turns it into an input box
bool start_text_input = false;
@@ -9199,7 +9196,7 @@ bool ImGui::DragFloat(const char* label, float* v, float v_speed, float v_min, f
// Actual drag behavior
ItemSize(total_bb, style.FramePadding.y);
const bool value_changed = DragBehavior(frame_bb, id, v, v_speed, v_min, v_max, decimal_precision, power);
const bool value_changed = DragBehavior(frame_bb, id, v, v_speed, v_min, v_max, format, power);
// Display value using user-provided display format so user can add prefix/suffix/decorations to the value.
char value_buf[64];