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- #1
Простите конечно за тупость, но как в этом слайдере, уменьшить размер?
C++:
bool ImGui::SliderBehavior(const ImRect& frame_bb, ImGuiID id, float* v, float v_min, float v_max, float power, int decimal_precision, ImGuiSliderFlags flags)
{
ImGuiContext& g = *GImGui;
ImGuiWindow* window = GetCurrentWindow();
const ImGuiStyle& style = g.Style;
const_cast<float&>(frame_bb.Max.y) -= 2;
const_cast<float&>(frame_bb.Min.y) += 2;
const bool is_non_linear = (power < 1.0f - 0.00001f) || (power > 1.0f + 0.00001f);
const bool is_horizontal = (flags & ImGuiSliderFlags_Vertical) == 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)
grab_sz = ImMin(style.GrabMinSize, slider_sz);
else
grab_sz = ImMin(ImMax(1.0f * (style.GrabMinSize), style.GrabMinSize), slider_sz); // Integer sliders, if possible have the grab size represent 1 unit
const float slider_usable_sz = slider_sz - grab_sz;
const float slider_usable_pos_min = (is_horizontal ? frame_bb.Min.x : frame_bb.Min.y) + grab_padding + grab_sz * 0.5f;
const float slider_usable_pos_max = (is_horizontal ? frame_bb.Max.x : frame_bb.Max.y) - grab_padding - grab_sz * 0.5f;
// For logarithmic sliders that cross over sign boundary we want the exponential increase to be symmetric around 0.0f
float linear_zero_pos = 0.0f; // 0.0->1.0f
if (v_min * v_max < 0.0f)
{
// Different sign
const float linear_dist_min_to_0 = powf(fabsf(0.0f - v_min), 1.0f / power);
const float linear_dist_max_to_0 = powf(fabsf(v_max - 0.0f), 1.0f / power);
linear_zero_pos = linear_dist_min_to_0 / (linear_dist_min_to_0 + linear_dist_max_to_0);
}
else
{
// Same sign
linear_zero_pos = v_min < 0.0f ? 1.0f : 0.0f;
}
// Process clicking on the slider
bool value_changed = false;
if (g.ActiveId == id)
{
bool set_new_value = false;
float clicked_t = 0.0f;
if (g.IO.MouseDown[0])
{
const float mouse_abs_pos = is_horizontal ? g.IO.MousePos.x : g.IO.MousePos.y;
clicked_t = (slider_usable_sz > 0.0f) ? ImClamp((mouse_abs_pos - slider_usable_pos_min) / slider_usable_sz, 0.0f, 1.0f) : 0.0f;
if (!is_horizontal)
clicked_t = 1.0f - clicked_t;
set_new_value = true;
}
else
{
ClearActiveID();
}
if (set_new_value)
{
float new_value;
if (is_non_linear)
{
// Account for logarithmic scale on both sides of the zero
if (clicked_t < linear_zero_pos)
{
// Negative: rescale to the negative range before powering
float a = 1.0f - (clicked_t / linear_zero_pos);
a = powf(a, power);
new_value = ImLerp(ImMin(v_max, 0.0f), v_min, a);
}
else
{
// Positive: rescale to the positive range before powering
float a;
if (fabsf(linear_zero_pos - 1.0f) > 1.e-6f)
a = (clicked_t - linear_zero_pos) / (1.0f - linear_zero_pos);
else
a = clicked_t;
a = powf(a, power);
new_value = ImLerp(ImMax(v_min, 0.0f), v_max, a);
}
}
else
{
// Linear slider
new_value = ImLerp(v_min, v_max, clicked_t);
}
// Round past decimal precision
new_value = RoundScalar(new_value, decimal_precision);
if (*v != new_value)
{
*v = new_value;
value_changed = true;
}
}
}
float grab_t = SliderBehaviorCalcRatioFromValue(*v, v_min, v_max, power, linear_zero_pos);
if (!is_horizontal)
grab_t = 1.0f - grab_t;
const float grab_pos = ImLerp(slider_usable_pos_min, slider_usable_pos_max, grab_t);
ImRect grab_bb;
if (is_horizontal)
grab_bb = ImRect(ImVec2(grab_pos - 2 - grab_sz * 0.5f, frame_bb.Min.y + grab_padding), ImVec2(grab_pos + 2 + grab_sz * 0.5f, frame_bb.Max.y - grab_padding));
else
grab_bb = ImRect(ImVec2(frame_bb.Min.x + grab_padding, grab_pos - grab_sz * 0.5f), ImVec2(frame_bb.Max.x - grab_padding, grab_pos + grab_sz * 0.5f));
window->DrawList->AddRectFilled(ImVec2(frame_bb.Min.x, frame_bb.Min.y - 0.5f + ((frame_bb.Max.y - 0.5f - frame_bb.Min.y - 0.5f) / 2)), ImVec2(frame_bb.Max.x, frame_bb.Min.y + 0.6f + ((frame_bb.Max.y + 0.5f - frame_bb.Min.y + 0.6f) / 2)), GetColorU32(ImVec4(0.1f, 0.1f, 0.1f, 1.f)));
window->DrawList->AddRectFilled(ImVec2(frame_bb.Min.x, frame_bb.Min.y - 0.5f + ((frame_bb.Max.y - 0.5f - frame_bb.Min.y - 0.5f) / 2)), ImVec2(grab_bb.Max.x, frame_bb.Min.y + 0.6f + ((frame_bb.Max.y + 0.6f - frame_bb.Min.y + 0.6f) / 2)), GetColorU32(ImGuiCol_Button));
window->DrawList->AddRectFilled(grab_bb.Min - ImVec2(0, 1) + ImVec2(3, 0), grab_bb.Max + ImVec2(0, 1), GetColorU32(g.ActiveId == id ? GetColorU32(ImGuiCol_ButtonActive) : GetColorU32(ImGuiCol_Button)), style.GrabRounding);
return value_changed;
}
// Use power!=1.0 for logarithmic sliders.
// Adjust display_format to decorate the value with a prefix or a suffix.
// "%.3f" 1.234
// "%5.2f secs" 01.23 secs
// "Gold: %.0f" Gold: 1
bool ImGui::SliderFloat(const char* label, float* v, float v_min, float v_max, const char* display_format, float power)
{
ImGuiWindow* window = GetCurrentWindow();
if (window->SkipItems)
return false;
ImGuiContext& g = *GImGui;
const ImGuiStyle& style = g.Style;
const ImGuiID id = window->GetID(label);
const float w = CalcItemWidth();
const ImVec2 label_size = CalcTextSize(label, NULL, true);
const ImRect frame_bb(window->DC.CursorPos, window->DC.CursorPos + ImVec2(w, label_size.y + style.FramePadding.y*2.0f));
const ImRect total_bb(frame_bb.Min, frame_bb.Max + ImVec2(label_size.x > 0.0f ? style.ItemInnerSpacing.x + label_size.x : 0.0f, 0.0f));
// NB- we don't call ItemSize() yet because we may turn into a text edit box below
if (!ItemAdd(total_bb, id))
{
ItemSize(total_bb, style.FramePadding.y);
return false;
}
const bool hovered = ItemHoverable(frame_bb, id);
if (!display_format)
display_format = "%.3f";
int decimal_precision = ParseFormatPrecision(display_format, 3);
// Tabbing or CTRL-clicking on Slider turns it into an input box
if ((hovered && g.IO.MouseClicked[0]))
{
SetActiveID(id, window);
FocusWindow(window);
}
// 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, 0.f);
// Display value using user-provided display format so user can add prefix/suffix/decorations to the value.
char value_buf[64];
const char* value_buf_end = value_buf + ImFormatString(value_buf, IM_ARRAYSIZE(value_buf), display_format, *v);
RenderTextClipped(ImVec2(frame_bb.Min.x, frame_bb.Min.y + 14), ImVec2(frame_bb.Max.x, frame_bb.Max.y + 14), value_buf, value_buf_end, NULL, ImVec2(0.f, 0.5f));
return value_changed;
}
