InputFloat,InputFloat2,InputFloat3,InputFloat4: Added variations taking a more flexible and consistent optional "const char* format" parameter instead of "int decimal_precision". This allow using custom formats to display values in scientific notation, and is generally more consistent with other API. Obsoleted functions using the optional "int decimal_precision" parameter. (#648)

CHANGELOG.txt

@@ -57,6 +57,8 @@ Other Changes:
 - InputText: On Mac OS X, filter out characters when the Cmd modifier is held. (#1747) [@sivu]
 - InputText: On Mac OS X, support Cmd+Shift+Z for Redo. Cmd+Y is also supported as major apps seems to default to support both. (#1765) [@lfnoise]
 - InputText: Fixed returning true when edition is cancelled with Esc and the current buffer matches the initial value.
+- InputFloat,InputFloat2,InputFloat3,InputFloat4: Added variations taking a more flexible and consistent optional "const char* format" parameter instead of "int decimal_precision". 
+  This allow using custom formats to display values in scientific notation, and is generally more consistent with other API. Obsoleted functions using the optional "int decimal_precision" parameter. (#648)
 - DragFloat, DragInt: Cancel mouse tweak when current value is initially past the min/max boundaries and mouse is pushing in the same direction (keyboard/gamepad version already did this).
 - DragFloat, SliderFloat: Fix to allow input of scientific notation numbers when using CTRL+Click to input the value. (~#648, #1011) 
 - Style: Changed default style.DisplaySafeAreaPadding values from (4,4) to (3,3) so it is smaller than FramePadding and has no effect on main menu bar on a computer. (#1439)

imgui.cpp

@@ -262,6 +262,7 @@
  Here is a change-log of API breaking changes, if you are using one of the functions listed, expect to have to fix some code.
  Also read releases logs https://github.com/ocornut/imgui/releases for more details.
 
+ - 2018/04/28 (1.61) - obsoleted InputFloat() functions taking an optional "int decimal_precision" in favor of an equivalent and more flexible "const char* format", consistent with other functions. Kept redirection functions (will obsolete).
  - 2018/04/09 (1.61) - IM_DELETE() helper function added in 1.60 doesn't clear the input _pointer_ reference, more consistent with expectation and allows passing r-value.
  - 2018/03/20 (1.60) - Renamed io.WantMoveMouse to io.WantSetMousePos for consistency and ease of understanding (was added in 1.52, _not_ used by core and only honored by some binding ahead of merging the Nav branch).
  - 2018/03/12 (1.60) - Removed ImGuiCol_CloseButton, ImGuiCol_CloseButtonActive, ImGuiCol_CloseButtonHovered as the closing cross uses regular button colors now.
@@ -10600,21 +10601,11 @@ bool ImGui::InputScalarEx(const char* label, ImGuiDataType data_type, void* data
     return value_changed;
 }
 
-bool ImGui::InputFloat(const char* label, float* v, float step, float step_fast, int decimal_precision, ImGuiInputTextFlags extra_flags)
+bool ImGui::InputFloat(const char* label, float* v, float step, float step_fast, const char* format, ImGuiInputTextFlags extra_flags)
 {
     extra_flags |= ImGuiInputTextFlags_CharsScientific;
-    if (decimal_precision < 0)
-    {
-        // Ideally we'd have a minimum decimal precision of 1 to visually denote that this is a float, while hiding non-significant digits? %f doesn't have a minimum of 1
-        return InputScalarEx(label, ImGuiDataType_Float, (void*)v, (void*)(step>0.0f ? &step : NULL), (void*)(step_fast>0.0f ? &step_fast : NULL), "%f", extra_flags);
-    }
-    else
-    {
-        char format[16];
-        ImFormatString(format, IM_ARRAYSIZE(format), "%%.%df", decimal_precision);
     return InputScalarEx(label, ImGuiDataType_Float, (void*)v, (void*)(step>0.0f ? &step : NULL), (void*)(step_fast>0.0f ? &step_fast : NULL), format, extra_flags);
 }
-}
 
 bool ImGui::InputDouble(const char* label, double* v, double step, double step_fast, const char* format, ImGuiInputTextFlags extra_flags)
 {
@@ -10625,11 +10616,11 @@ bool ImGui::InputDouble(const char* label, double* v, double step, double step_f
 bool ImGui::InputInt(const char* label, int* v, int step, int step_fast, ImGuiInputTextFlags extra_flags)
 {
     // Hexadecimal input provided as a convenience but the flag name is awkward. Typically you'd use InputText() to parse your own data, if you want to handle prefixes.
-    const char* scalar_format = (extra_flags & ImGuiInputTextFlags_CharsHexadecimal) ? "%08X" : "%d";
+    const char* format = (extra_flags & ImGuiInputTextFlags_CharsHexadecimal) ? "%08X" : "%d";
-    return InputScalarEx(label, ImGuiDataType_Int, (void*)v, (void*)(step>0 ? &step : NULL), (void*)(step_fast>0 ? &step_fast : NULL), scalar_format, extra_flags);
+    return InputScalarEx(label, ImGuiDataType_Int, (void*)v, (void*)(step>0 ? &step : NULL), (void*)(step_fast>0 ? &step_fast : NULL), format, extra_flags);
 }
 
-bool ImGui::InputFloatN(const char* label, float* v, int components, int decimal_precision, ImGuiInputTextFlags extra_flags)
+bool ImGui::InputFloatN(const char* label, float* v, int components, const char* format, ImGuiInputTextFlags extra_flags)
 {
     ImGuiWindow* window = GetCurrentWindow();
     if (window->SkipItems)
@@ -10643,7 +10634,7 @@ bool ImGui::InputFloatN(const char* label, float* v, int components, int decimal
     for (int i = 0; i < components; i++)
     {
         PushID(i);
-        value_changed |= InputFloat("##v", &v[i], 0, 0, decimal_precision, extra_flags);
+        value_changed |= InputFloat("##v", &v[i], 0, 0, format, extra_flags);
         SameLine(0, g.Style.ItemInnerSpacing.x);
         PopID();
         PopItemWidth();
@@ -10656,20 +10647,55 @@ bool ImGui::InputFloatN(const char* label, float* v, int components, int decimal
     return value_changed;
 }
 
+bool ImGui::InputFloat2(const char* label, float v[2], const char* format, ImGuiInputTextFlags extra_flags)
+{
+    return InputFloatN(label, v, 2, format, extra_flags);
+}
+
+bool ImGui::InputFloat3(const char* label, float v[3], const char* format, ImGuiInputTextFlags extra_flags)
+{
+    return InputFloatN(label, v, 3, format, extra_flags);
+}
+
+bool ImGui::InputFloat4(const char* label, float v[4], const char* format, ImGuiInputTextFlags extra_flags)
+{
+    return InputFloatN(label, v, 4, format, extra_flags);
+}
+
+// Prefer using "const char* format" directly, which is more flexible and consistent with other API.
+#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
+bool ImGui::InputFloat(const char* label, float* v, float step, float step_fast, int decimal_precision, ImGuiInputTextFlags extra_flags)
+{
+    char format[16] = "%f";
+    if (decimal_precision >= 0)
+        ImFormatString(format, IM_ARRAYSIZE(format), "%%.%df", decimal_precision);
+    return InputFloat(label, v, step, step_fast, format, extra_flags);
+}
+
 bool ImGui::InputFloat2(const char* label, float v[2], int decimal_precision, ImGuiInputTextFlags extra_flags)
 {
-    return InputFloatN(label, v, 2, decimal_precision, extra_flags);
+    char format[16] = "%f";
+    if (decimal_precision >= 0)
+        ImFormatString(format, IM_ARRAYSIZE(format), "%%.%df", decimal_precision);
+    return InputFloatN(label, v, 2, format, extra_flags);
 }
 
 bool ImGui::InputFloat3(const char* label, float v[3], int decimal_precision, ImGuiInputTextFlags extra_flags)
 {
-    return InputFloatN(label, v, 3, decimal_precision, extra_flags);
+    char format[16] = "%f";
+    if (decimal_precision >= 0)
+        ImFormatString(format, IM_ARRAYSIZE(format), "%%.%df", decimal_precision);
+    return InputFloatN(label, v, 3, format, extra_flags);
 }
 
 bool ImGui::InputFloat4(const char* label, float v[4], int decimal_precision, ImGuiInputTextFlags extra_flags)
 {
-    return InputFloatN(label, v, 4, decimal_precision, extra_flags);
+    char format[16] = "%f";
+    if (decimal_precision >= 0)
+        ImFormatString(format, IM_ARRAYSIZE(format), "%%.%df", decimal_precision);
+    return InputFloatN(label, v, 4, format, extra_flags);
 }
+#endif // IMGUI_DISABLE_OBSOLETE_FUNCTIONS
 
 bool ImGui::InputIntN(const char* label, int* v, int components, ImGuiInputTextFlags extra_flags)
 {

imgui.h

@@ -350,10 +350,10 @@ namespace ImGui
     // Widgets: Input with Keyboard
     IMGUI_API bool          InputText(const char* label, char* buf, size_t buf_size, ImGuiInputTextFlags flags = 0, ImGuiTextEditCallback callback = NULL, void* user_data = NULL);
     IMGUI_API bool          InputTextMultiline(const char* label, char* buf, size_t buf_size, const ImVec2& size = ImVec2(0,0), ImGuiInputTextFlags flags = 0, ImGuiTextEditCallback callback = NULL, void* user_data = NULL);
-    IMGUI_API bool          InputFloat(const char* label, float* v, float step = 0.0f, float step_fast = 0.0f, int decimal_precision = -1, ImGuiInputTextFlags extra_flags = 0);
+    IMGUI_API bool          InputFloat(const char* label, float* v, float step = 0.0f, float step_fast = 0.0f, const char* format = "%.3f", ImGuiInputTextFlags extra_flags = 0);
-    IMGUI_API bool          InputFloat2(const char* label, float v[2], int decimal_precision = -1, ImGuiInputTextFlags extra_flags = 0);
+    IMGUI_API bool          InputFloat2(const char* label, float v[2], const char* format = "%.3f", ImGuiInputTextFlags extra_flags = 0);
-    IMGUI_API bool          InputFloat3(const char* label, float v[3], int decimal_precision = -1, ImGuiInputTextFlags extra_flags = 0);
+    IMGUI_API bool          InputFloat3(const char* label, float v[3], const char* format = "%.3f", ImGuiInputTextFlags extra_flags = 0);
-    IMGUI_API bool          InputFloat4(const char* label, float v[4], int decimal_precision = -1, ImGuiInputTextFlags extra_flags = 0);
+    IMGUI_API bool          InputFloat4(const char* label, float v[4], const char* format = "%.3f", ImGuiInputTextFlags extra_flags = 0);
     IMGUI_API bool          InputInt(const char* label, int* v, int step = 1, int step_fast = 100, ImGuiInputTextFlags extra_flags = 0);
     IMGUI_API bool          InputInt2(const char* label, int v[2], ImGuiInputTextFlags extra_flags = 0);
     IMGUI_API bool          InputInt3(const char* label, int v[3], ImGuiInputTextFlags extra_flags = 0);
@@ -1116,6 +1116,11 @@ struct ImGuiIO
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
 namespace ImGui
 {
+    // OBSOLETED in 1.61 (from Apr 2018)
+    bool                InputFloat(const char* label, float* v, float step, float step_fast, int decimal_precision, ImGuiInputTextFlags extra_flags = 0); // Use the 'const char* format' version instead of 'decimal_precision'!
+    bool                InputFloat2(const char* label, float v[2], int decimal_precision, ImGuiInputTextFlags extra_flags = 0);
+    bool                InputFloat3(const char* label, float v[3], int decimal_precision, ImGuiInputTextFlags extra_flags = 0);
+    bool                InputFloat4(const char* label, float v[4], int decimal_precision, ImGuiInputTextFlags extra_flags = 0);
     // OBSOLETED in 1.60 (from Dec 2017)
     static inline bool  IsAnyWindowFocused()                  { return IsWindowFocused(ImGuiFocusedFlags_AnyWindow); }
     static inline bool  IsAnyWindowHovered()                  { return IsWindowHovered(ImGuiHoveredFlags_AnyWindow); }

imgui_demo.cpp

@@ -336,18 +336,20 @@ void ImGui::ShowDemoWindow(bool* p_open)
             {
                 static char str0[128] = "Hello, world!";
                 static int i0 = 123;
-                static float f0 = 0.001f;
                 ImGui::InputText("input text", str0, IM_ARRAYSIZE(str0));
                 ImGui::SameLine(); ShowHelpMarker("Hold SHIFT or use mouse to select text.\n" "CTRL+Left/Right to word jump.\n" "CTRL+A or double-click to select all.\n" "CTRL+X,CTRL+C,CTRL+V clipboard.\n" "CTRL+Z,CTRL+Y undo/redo.\n" "ESCAPE to revert.\n");
 
                 ImGui::InputInt("input int", &i0);
                 ImGui::SameLine(); ShowHelpMarker("You can apply arithmetic operators +,*,/ on numerical values.\n  e.g. [ 100 ], input \'*2\', result becomes [ 200 ]\nUse +- to subtract.\n");
 
+                static float f0 = 0.001f;
                 ImGui::InputFloat("input float", &f0, 0.01f, 1.0f);
 
-                // NB: You can use the %e notation as well.
                 static double d0 = 999999.000001;
                 ImGui::InputDouble("input double", &d0, 0.01f, 1.0f, "%.6f");
+
+                static float f1 = 1.e10f;
+                ImGui::InputFloat("input scientific", &f1, 0.0f, 0.0f, "%e");
                 ImGui::SameLine(); ShowHelpMarker("You can input value using the scientific notation,\n  e.g. \"1e+8\" becomes \"100000000\".\n");
 
                 static float vec4a[4] = { 0.10f, 0.20f, 0.30f, 0.44f };

imgui_internal.h

@@ -1105,7 +1105,7 @@ namespace ImGui
     IMGUI_API bool          DragIntN(const char* label, int* v, int components, float v_speed, int v_min, int v_max, const char* display_format);
 
     IMGUI_API bool          InputTextEx(const char* label, char* buf, int buf_size, const ImVec2& size_arg, ImGuiInputTextFlags flags, ImGuiTextEditCallback callback = NULL, void* user_data = NULL);
-    IMGUI_API bool          InputFloatN(const char* label, float* v, int components, int decimal_precision, ImGuiInputTextFlags extra_flags);
+    IMGUI_API bool          InputFloatN(const char* label, float* v, int components, const char* format, ImGuiInputTextFlags extra_flags);
     IMGUI_API bool          InputIntN(const char* label, int* v, int components, ImGuiInputTextFlags extra_flags);
     IMGUI_API bool          InputScalarEx(const char* label, ImGuiDataType data_type, void* data_ptr, void* step_ptr, void* step_fast_ptr, const char* scalar_format, ImGuiInputTextFlags extra_flags);
     IMGUI_API bool          InputScalarAsWidgetReplacement(const ImRect& aabb, const char* label, ImGuiDataType data_type, void* data_ptr, ImGuiID id, int decimal_precision);