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Drags, Sliders: Added deadzone to make selecting 0.0 on linear sliders easier, slider navigation delta accumulation. (#3361, #1823, #1316, #642)

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This commit is contained in:
Ben Carter
2020-07-26 11:42:06 +09:00
committed by ocornut
parent f75b29e7be
commit fa279a6aa0
5 changed files with 66 additions and 19 deletions
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74
imgui_widgets.cpp
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@ -2061,6 +2061,7 @@ bool ImGui::DragBehaviorT(ImGuiDataType data_type, TYPE* v, float v_speed, const
FLOATTYPE v_old_ref_for_accum_remainder = (FLOATTYPE)0.0f;
float logarithmic_zero_epsilon = 0.0f; // Only valid when is_logarithmic is true
const float zero_deadzone_size = 0.0f; // Drag widgets have no deadzone (as it doesn't make sense)
if (is_logarithmic)
{
// When using logarithmic sliders, we need to clamp to avoid hitting zero, but our choice of clamp value greatly affects slider precision. We attempt to use the specified precision to estimate a good lower bound.
@ -2068,9 +2069,9 @@ bool ImGui::DragBehaviorT(ImGuiDataType data_type, TYPE* v, float v_speed, const
logarithmic_zero_epsilon = ImPow(0.1f, (float)decimal_precision);
// Convert to parametric space, apply delta, convert back
float v_old_parametric = SliderCalcRatioFromValueT<TYPE, FLOATTYPE>(data_type, v_cur, v_min, v_max, logarithmic_zero_epsilon, flags);
float v_old_parametric = SliderCalcRatioFromValueT<TYPE, FLOATTYPE>(data_type, v_cur, v_min, v_max, logarithmic_zero_epsilon, zero_deadzone_size, flags);
float v_new_parametric = v_old_parametric + g.DragCurrentAccum;
v_cur = SliderCalcValueFromRatioT<TYPE, FLOATTYPE>(data_type, v_new_parametric, v_min, v_max, logarithmic_zero_epsilon, flags);
v_cur = SliderCalcValueFromRatioT<TYPE, FLOATTYPE>(data_type, v_new_parametric, v_min, v_max, logarithmic_zero_epsilon, zero_deadzone_size, flags);
v_old_ref_for_accum_remainder = v_old_parametric;
}
else
@ -2087,7 +2088,7 @@ bool ImGui::DragBehaviorT(ImGuiDataType data_type, TYPE* v, float v_speed, const
if (is_logarithmic)
{
// Convert to parametric space, apply delta, convert back
float v_new_parametric = SliderCalcRatioFromValueT<TYPE, FLOATTYPE>(data_type, v_cur, v_min, v_max, logarithmic_zero_epsilon, flags);
float v_new_parametric = SliderCalcRatioFromValueT<TYPE, FLOATTYPE>(data_type, v_cur, v_min, v_max, logarithmic_zero_epsilon, zero_deadzone_size, flags);
g.DragCurrentAccum -= (float)(v_new_parametric - v_old_ref_for_accum_remainder);
}
else
@ -2420,7 +2421,7 @@ bool ImGui::DragScalarN(const char* label, ImGuiDataType data_type, void* p_data
// Convert a value v in the output space of a slider into a parametric position on the slider itself (the logical opposite of SliderCalcValueFromRatioT)
template<typename TYPE, typename FLOATTYPE>
float ImGui::SliderCalcRatioFromValueT(ImGuiDataType data_type, TYPE v, TYPE v_min, TYPE v_max, float logarithmic_zero_epsilon, ImGuiSliderFlags flags)
float ImGui::SliderCalcRatioFromValueT(ImGuiDataType data_type, TYPE v, TYPE v_min, TYPE v_max, float logarithmic_zero_epsilon, float zero_deadzone_size, ImGuiSliderFlags flags)
{
if (v_min == v_max)
return 0.0f;
@ -2456,9 +2457,9 @@ float ImGui::SliderCalcRatioFromValueT(ImGuiDataType data_type, TYPE v, TYPE v_m
if (v == 0.0f)
result = zero_point; // Special case for exactly zero
else if (v < 0.0f)
result = (1.0f - (float)(ImLog(-(FLOATTYPE)v_clamped / logarithmic_zero_epsilon) / ImLog(-v_min_fudged / logarithmic_zero_epsilon))) * zero_point;
result = (1.0f - (float)(ImLog(-(FLOATTYPE)v_clamped / logarithmic_zero_epsilon) / ImLog(-v_min_fudged / logarithmic_zero_epsilon))) * (zero_point - zero_deadzone_size);
else
result = zero_point + ((float)(ImLog((FLOATTYPE)v_clamped / logarithmic_zero_epsilon) / ImLog(v_max_fudged / logarithmic_zero_epsilon)) * (1.0f - zero_point));
result = zero_point + zero_deadzone_size + ((float)(ImLog((FLOATTYPE)v_clamped / logarithmic_zero_epsilon) / ImLog(v_max_fudged / logarithmic_zero_epsilon)) * (1.0f - (zero_point + zero_deadzone_size)));
}
else if ((v_min < 0.0f) || (v_max < 0.0f)) // Entirely negative slider
result = 1.0f - (float)(ImLog(-(FLOATTYPE)v_clamped / -v_max_fudged) / ImLog(-v_min_fudged / -v_max_fudged));
@ -2474,7 +2475,7 @@ float ImGui::SliderCalcRatioFromValueT(ImGuiDataType data_type, TYPE v, TYPE v_m
// Convert a parametric position on a slider into a value v in the output space (the logical opposite of SliderCalcRatioFromValueT)
template<typename TYPE, typename FLOATTYPE>
TYPE ImGui::SliderCalcValueFromRatioT(ImGuiDataType data_type, float t, TYPE v_min, TYPE v_max, float logarithmic_zero_epsilon, ImGuiSliderFlags flags)
TYPE ImGui::SliderCalcValueFromRatioT(ImGuiDataType data_type, float t, TYPE v_min, TYPE v_max, float logarithmic_zero_epsilon, float zero_deadzone_size, ImGuiSliderFlags flags)
{
if (v_min == v_max)
return (TYPE)0.0f;
@ -2510,12 +2511,12 @@ TYPE ImGui::SliderCalcValueFromRatioT(ImGuiDataType data_type, float t, TYPE v_m
if ((v_min * v_max) < 0.0f) // Range crosses zero, so we have to do this in two parts
{
float zero_point = (-(float)ImMin(v_min, v_max)) / ImAbs((float)v_max - (float)v_min); // The zero point in parametric space
if (t_with_flip == zero_point)
if ((t_with_flip >= (zero_point - zero_deadzone_size)) && (t_with_flip <= (zero_point + zero_deadzone_size)))
result = (TYPE)0.0f; // Special case to make getting exactly zero possible (the epsilon prevents it otherwise)
else if (t_with_flip < zero_point)
result = (TYPE)-(logarithmic_zero_epsilon * ImPow(-v_min_fudged / logarithmic_zero_epsilon, (FLOATTYPE)(1.0f - (t_with_flip / zero_point))));
result = (TYPE)-(logarithmic_zero_epsilon * ImPow(-v_min_fudged / logarithmic_zero_epsilon, (FLOATTYPE)(1.0f - (t_with_flip / (zero_point - zero_deadzone_size)))));
else
result = (TYPE)(logarithmic_zero_epsilon * ImPow(v_max_fudged / logarithmic_zero_epsilon, (FLOATTYPE)((t_with_flip - zero_point) / (1.0f - zero_point))));
result = (TYPE)(logarithmic_zero_epsilon * ImPow(v_max_fudged / logarithmic_zero_epsilon, (FLOATTYPE)((t_with_flip - (zero_point + zero_deadzone_size)) / (1.0f - (zero_point + zero_deadzone_size)))));
}
else if ((v_min < 0.0f) || (v_max < 0.0f)) // Entirely negative slider
result = (TYPE)-(-v_max_fudged * ImPow(-v_min_fudged / -v_max_fudged, (FLOATTYPE)(1.0f - t_with_flip)));
@ -2567,14 +2568,16 @@ bool ImGui::SliderBehaviorT(const ImRect& bb, ImGuiID id, ImGuiDataType data_typ
grab_sz = ImMin(grab_sz, slider_sz);
const float slider_usable_sz = slider_sz - grab_sz;
const float slider_usable_pos_min = bb.Min[axis] + grab_padding + grab_sz * 0.5f;
const float slider_usable_pos_max = bb.Max[axis] - grab_padding - grab_sz * 0.5f;
const float slider_usable_pos_max = bb.Max[axis] - grab_padding - grab_sz * 0.5f;
float logarithmic_zero_epsilon = 0.0f; // Only valid when is_logarithmic is true
float zero_deadzone_size = 0.0f; // Only valid when is_logarithmic is true
if (is_logarithmic)
{
// When using logarithmic sliders, we need to clamp to avoid hitting zero, but our choice of clamp value greatly affects slider precision. We attempt to use the specified precision to estimate a good lower bound.
const int decimal_precision = is_decimal ? ImParseFormatPrecision(format, 3) : 1;
logarithmic_zero_epsilon = ImPow(0.1f, (float)decimal_precision);
zero_deadzone_size = (style.LogSliderDeadzone * 0.5f) / ImMax(slider_usable_sz, 1.0f);
}
// Process interacting with the slider
@ -2602,13 +2605,15 @@ bool ImGui::SliderBehaviorT(const ImRect& bb, ImGuiID id, ImGuiDataType data_typ
{
const ImVec2 delta2 = GetNavInputAmount2d(ImGuiNavDirSourceFlags_Keyboard | ImGuiNavDirSourceFlags_PadDPad, ImGuiInputReadMode_RepeatFast, 0.0f, 0.0f);
float delta = (axis == ImGuiAxis_X) ? delta2.x : -delta2.y;
if (g.NavActivatePressedId == id && !g.ActiveIdIsJustActivated)
if (g.ActiveIdIsJustActivated)
{
ClearActiveID();
g.SliderCurrentAccum = 0.0f; // Reset any stored nav delta upon activation
g.SliderCurrentAccumDirty = false;
}
else if (delta != 0.0f)
if (delta != 0.0f)
{
clicked_t = SliderCalcRatioFromValueT<TYPE, FLOATTYPE>(data_type, *v, v_min, v_max, logarithmic_zero_epsilon, flags);
const int decimal_precision = is_decimal ? ImParseFormatPrecision(format, 3) : 0;
if (decimal_precision > 0)
{
@ -2625,17 +2630,52 @@ bool ImGui::SliderBehaviorT(const ImRect& bb, ImGuiID id, ImGuiDataType data_typ
}
if (IsNavInputDown(ImGuiNavInput_TweakFast))
delta *= 10.0f;
g.SliderCurrentAccum += delta;
g.SliderCurrentAccumDirty = true;
delta = g.SliderCurrentAccum;
}
if (g.NavActivatePressedId == id && !g.ActiveIdIsJustActivated)
{
ClearActiveID();
}
else if (g.SliderCurrentAccumDirty)
{
clicked_t = SliderCalcRatioFromValueT<TYPE, FLOATTYPE>(data_type, *v, v_min, v_max, logarithmic_zero_epsilon, zero_deadzone_size, flags);
set_new_value = true;
if ((clicked_t >= 1.0f && delta > 0.0f) || (clicked_t <= 0.0f && delta < 0.0f)) // This is to avoid applying the saturation when already past the limits
{
set_new_value = false;
g.SliderCurrentAccum = 0.0f; // If pushing up against the limits, don't continue to accumulate
}
else
{
float old_clicked_t = clicked_t;
clicked_t = ImSaturate(clicked_t + delta);
// Calculate what our "new" clicked_t will be, and thus how far we actually moved the slider, and subtract this from the accumulator
TYPE v_new = SliderCalcValueFromRatioT<TYPE, FLOATTYPE>(data_type, clicked_t, v_min, v_max, logarithmic_zero_epsilon, zero_deadzone_size, flags);
if (!(flags & ImGuiSliderFlags_NoRoundToFormat))
v_new = RoundScalarWithFormatT<TYPE, SIGNEDTYPE>(format, data_type, v_new);
float new_clicked_t = SliderCalcRatioFromValueT<TYPE, FLOATTYPE>(data_type, v_new, v_min, v_max, logarithmic_zero_epsilon, zero_deadzone_size, flags);
if (delta > 0)
g.SliderCurrentAccum -= ImMin(new_clicked_t - old_clicked_t, delta);
else
g.SliderCurrentAccum -= ImMax(new_clicked_t - old_clicked_t, delta);
}
g.SliderCurrentAccumDirty = false;
}
}
if (set_new_value)
{
TYPE v_new = SliderCalcValueFromRatioT<TYPE, FLOATTYPE>(data_type, clicked_t, v_min, v_max, logarithmic_zero_epsilon, flags);
TYPE v_new = SliderCalcValueFromRatioT<TYPE, FLOATTYPE>(data_type, clicked_t, v_min, v_max, logarithmic_zero_epsilon, zero_deadzone_size, flags);
// Round to user desired precision based on format string
if (!(flags & ImGuiSliderFlags_NoRoundToFormat))
@ -2657,7 +2697,7 @@ bool ImGui::SliderBehaviorT(const ImRect& bb, ImGuiID id, ImGuiDataType data_typ
else
{
// Output grab position so it can be displayed by the caller
float grab_t = SliderCalcRatioFromValueT<TYPE, FLOATTYPE>(data_type, *v, v_min, v_max, logarithmic_zero_epsilon, flags);
float grab_t = SliderCalcRatioFromValueT<TYPE, FLOATTYPE>(data_type, *v, v_min, v_max, logarithmic_zero_epsilon, zero_deadzone_size, flags);
if (axis == ImGuiAxis_Y)
grab_t = 1.0f - grab_t;
const float grab_pos = ImLerp(slider_usable_pos_min, slider_usable_pos_max, grab_t);