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Demo: Improved "Constrained-resizing window" example, more clearly showcase aspect-ratio. (#5627, #5618)

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ocornut 2022-09-01 10:51:15 +02:00
parent 7f25143972
commit 2569c64740
3 changed files with 79 additions and 39 deletions
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2
docs/CHANGELOG.txt
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@ -88,6 +88,8 @@ Other Changes:
- Debug Tools: Debug Log: Added 'IO' and 'Clipper' events logging.
- Debug Tools: Item Picker: Mouse button can be changed by holding Ctrl+Shift, making it easier
to use the Item Picker in e.g. menus. (#2673)
- Demo: Improved "Constrained-resizing window" example, more clearly showcase aspect-ratio. (#5627)
- Demo: Added more explicit "Center window" mode to "Overlay example". (#5618)
- Backends: Metal: Use __bridge for ARC based systems. (#5403) [@stack]
- Backends: Metal: Add dispatch synchronization. (#5447) [@luigifcruz]
- Backends: Metal: Update deprecated property 'sampleCount'->'rasterSampleCount'. (#5603) [@dcvz]

4
imgui.h
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@ -1718,7 +1718,7 @@ enum ImGuiMouseCursor_
enum ImGuiCond_
{
ImGuiCond_None = 0, // No condition (always set the variable), same as _Always
ImGuiCond_Always = 1 << 0, // No condition (always set the variable)
ImGuiCond_Always = 1 << 0, // No condition (always set the variable), same as _None
ImGuiCond_Once = 1 << 1, // Set the variable once per runtime session (only the first call will succeed)
ImGuiCond_FirstUseEver = 1 << 2, // Set the variable if the object/window has no persistently saved data (no entry in .ini file)
ImGuiCond_Appearing = 1 << 3, // Set the variable if the object/window is appearing after being hidden/inactive (or the first time)
@ -2097,7 +2097,7 @@ struct ImGuiInputTextCallbackData
// NB: For basic min/max size constraint on each axis you don't need to use the callback! The SetNextWindowSizeConstraints() parameters are enough.
struct ImGuiSizeCallbackData
{
void* UserData; // Read-only. What user passed to SetNextWindowSizeConstraints()
void* UserData; // Read-only. What user passed to SetNextWindowSizeConstraints(). Generally store an integer or float in here (need reinterpret_cast<>).
ImVec2 Pos; // Read-only. Window position, for reference.
ImVec2 CurrentSize; // Read-only. Current window size.
ImVec2 DesiredSize; // Read-write. Desired size, based on user's mouse position. Write to this field to restrain resizing.

102
imgui_demo.cpp
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@ -7289,52 +7289,83 @@ static void ShowExampleAppAutoResize(bool* p_open)
//-----------------------------------------------------------------------------
// Demonstrate creating a window with custom resize constraints.
// Note that size constraints currently don't work on a docked window (when in 'docking' branch)
static void ShowExampleAppConstrainedResize(bool* p_open)
{
struct CustomConstraints
{
// Helper functions to demonstrate programmatic constraints
static void Square(ImGuiSizeCallbackData* data) { data->DesiredSize.x = data->DesiredSize.y = IM_MAX(data->DesiredSize.x, data->DesiredSize.y); }
static void Step(ImGuiSizeCallbackData* data) { float step = (float)(int)(intptr_t)data->UserData; data->DesiredSize = ImVec2((int)(data->DesiredSize.x / step + 0.5f) * step, (int)(data->DesiredSize.y / step + 0.5f) * step); }
// FIXME: This doesn't take account of decoration size (e.g. title bar), library should make this easier.
static void AspectRatio(ImGuiSizeCallbackData* data) { float aspect_ratio = *(float*)data->UserData; data->DesiredSize.x = IM_MAX(data->CurrentSize.x, data->CurrentSize.y); data->DesiredSize.y = (float)(int)(data->DesiredSize.x / aspect_ratio); }
static void Square(ImGuiSizeCallbackData* data) { data->DesiredSize.x = data->DesiredSize.y = IM_MAX(data->CurrentSize.x, data->CurrentSize.y); }
static void Step(ImGuiSizeCallbackData* data) { float step = *(float*)data->UserData; data->DesiredSize = ImVec2((int)(data->CurrentSize.x / step + 0.5f) * step, (int)(data->CurrentSize.y / step + 0.5f) * step); }
};
const char* test_desc[] =
{
"Between 100x100 and 500x500",
"At least 100x100",
"Resize vertical only",
"Resize horizontal only",
"Width > 100, Height > 100",
"Width 400-500",
"Height 400-500",
"Width Between 400 and 500",
"Custom: Aspect Ratio 16:9",
"Custom: Always Square",
"Custom: Fixed Steps (100)",
};
// Options
static bool auto_resize = false;
static int type = 0;
static bool window_padding = true;
static int type = 5; // Aspect Ratio
static int display_lines = 10;
if (type == 0) ImGui::SetNextWindowSizeConstraints(ImVec2(-1, 0), ImVec2(-1, FLT_MAX)); // Vertical only
if (type == 1) ImGui::SetNextWindowSizeConstraints(ImVec2(0, -1), ImVec2(FLT_MAX, -1)); // Horizontal only
if (type == 2) ImGui::SetNextWindowSizeConstraints(ImVec2(100, 100), ImVec2(FLT_MAX, FLT_MAX)); // Width > 100, Height > 100
if (type == 3) ImGui::SetNextWindowSizeConstraints(ImVec2(400, -1), ImVec2(500, -1)); // Width 400-500
if (type == 4) ImGui::SetNextWindowSizeConstraints(ImVec2(-1, 400), ImVec2(-1, 500)); // Height 400-500
if (type == 5) ImGui::SetNextWindowSizeConstraints(ImVec2(0, 0), ImVec2(FLT_MAX, FLT_MAX), CustomConstraints::Square); // Always Square
if (type == 6) ImGui::SetNextWindowSizeConstraints(ImVec2(0, 0), ImVec2(FLT_MAX, FLT_MAX), CustomConstraints::Step, (void*)(intptr_t)100); // Fixed Step
ImGuiWindowFlags flags = auto_resize ? ImGuiWindowFlags_AlwaysAutoResize : 0;
if (ImGui::Begin("Example: Constrained Resize", p_open, flags))
// Submit constraint
float aspect_ratio = 16.0f / 9.0f;
float fixed_step = 100.0f;
if (type == 0) ImGui::SetNextWindowSizeConstraints(ImVec2(100, 100), ImVec2(500, 500)); // Between 100x100 and 500x500
if (type == 1) ImGui::SetNextWindowSizeConstraints(ImVec2(100, 100), ImVec2(FLT_MAX, FLT_MAX)); // Width > 100, Height > 100
if (type == 2) ImGui::SetNextWindowSizeConstraints(ImVec2(-1, 0), ImVec2(-1, FLT_MAX)); // Vertical only
if (type == 3) ImGui::SetNextWindowSizeConstraints(ImVec2(0, -1), ImVec2(FLT_MAX, -1)); // Horizontal only
if (type == 4) ImGui::SetNextWindowSizeConstraints(ImVec2(400, -1), ImVec2(500, -1)); // Width Between and 400 and 500
if (type == 5) ImGui::SetNextWindowSizeConstraints(ImVec2(0, 0), ImVec2(FLT_MAX, FLT_MAX), CustomConstraints::AspectRatio, (void*)&aspect_ratio); // Aspect ratio
if (type == 6) ImGui::SetNextWindowSizeConstraints(ImVec2(0, 0), ImVec2(FLT_MAX, FLT_MAX), CustomConstraints::Square); // Always Square
if (type == 7) ImGui::SetNextWindowSizeConstraints(ImVec2(0, 0), ImVec2(FLT_MAX, FLT_MAX), CustomConstraints::Step, (void*)&fixed_step); // Fixed Step
// Submit window
if (!window_padding)
ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(0.0f, 0.0f));
const ImGuiWindowFlags window_flags = auto_resize ? ImGuiWindowFlags_AlwaysAutoResize : 0;
const bool window_open = ImGui::Begin("Example: Constrained Resize", p_open, window_flags);
if (!window_padding)
ImGui::PopStyleVar();
if (window_open)
{
IMGUI_DEMO_MARKER("Examples/Constrained Resizing window");
if (ImGui::Button("200x200")) { ImGui::SetWindowSize(ImVec2(200, 200)); } ImGui::SameLine();
if (ImGui::Button("500x500")) { ImGui::SetWindowSize(ImVec2(500, 500)); } ImGui::SameLine();
if (ImGui::Button("800x200")) { ImGui::SetWindowSize(ImVec2(800, 200)); }
ImGui::SetNextItemWidth(200);
if (ImGui::GetIO().KeyShift)
{
// Display a dummy viewport (in your real app you would likely use ImageButton() to display a texture.
ImVec2 avail_size = ImGui::GetContentRegionAvail();
ImVec2 pos = ImGui::GetCursorScreenPos();
ImGui::ColorButton("viewport", ImVec4(0.5f, 0.2f, 0.5f, 1.0f), ImGuiColorEditFlags_NoTooltip | ImGuiColorEditFlags_NoDragDrop, avail_size);
ImGui::SetCursorScreenPos(ImVec2(pos.x + 10, pos.y + 10));
ImGui::Text("%.2f x %.2f", avail_size.x, avail_size.y);
}
else
{
ImGui::Text("(Hold SHIFT to display a dummy viewport)");
if (ImGui::Button("Set 200x200")) { ImGui::SetWindowSize(ImVec2(200, 200)); } ImGui::SameLine();
if (ImGui::Button("Set 500x500")) { ImGui::SetWindowSize(ImVec2(500, 500)); } ImGui::SameLine();
if (ImGui::Button("Set 800x200")) { ImGui::SetWindowSize(ImVec2(800, 200)); }
ImGui::SetNextItemWidth(ImGui::GetFontSize() * 20);
ImGui::Combo("Constraint", &type, test_desc, IM_ARRAYSIZE(test_desc));
ImGui::SetNextItemWidth(200);
ImGui::SetNextItemWidth(ImGui::GetFontSize() * 20);
ImGui::DragInt("Lines", &display_lines, 0.2f, 1, 100);
ImGui::Checkbox("Auto-resize", &auto_resize);
ImGui::Checkbox("Window padding", &window_padding);
for (int i = 0; i < display_lines; i++)
ImGui::Text("%*sHello, sailor! Making this line long enough for the example.", i * 4, "");
}
}
ImGui::End();
}
@ -7346,28 +7377,34 @@ static void ShowExampleAppConstrainedResize(bool* p_open)
// + a context-menu to choose which corner of the screen to use.
static void ShowExampleAppSimpleOverlay(bool* p_open)
{
static int corner = 0;
static int location = 0;
ImGuiIO& io = ImGui::GetIO();
ImGuiWindowFlags window_flags = ImGuiWindowFlags_NoDecoration | ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoSavedSettings | ImGuiWindowFlags_NoFocusOnAppearing | ImGuiWindowFlags_NoNav;
if (corner != -1)
if (location >= 0)
{
const float PAD = 10.0f;
const ImGuiViewport* viewport = ImGui::GetMainViewport();
ImVec2 work_pos = viewport->WorkPos; // Use work area to avoid menu-bar/task-bar, if any!
ImVec2 work_size = viewport->WorkSize;
ImVec2 window_pos, window_pos_pivot;
window_pos.x = (corner & 1) ? (work_pos.x + work_size.x - PAD) : (work_pos.x + PAD);
window_pos.y = (corner & 2) ? (work_pos.y + work_size.y - PAD) : (work_pos.y + PAD);
window_pos_pivot.x = (corner & 1) ? 1.0f : 0.0f;
window_pos_pivot.y = (corner & 2) ? 1.0f : 0.0f;
window_pos.x = (location & 1) ? (work_pos.x + work_size.x - PAD) : (work_pos.x + PAD);
window_pos.y = (location & 2) ? (work_pos.y + work_size.y - PAD) : (work_pos.y + PAD);
window_pos_pivot.x = (location & 1) ? 1.0f : 0.0f;
window_pos_pivot.y = (location & 2) ? 1.0f : 0.0f;
ImGui::SetNextWindowPos(window_pos, ImGuiCond_Always, window_pos_pivot);
window_flags |= ImGuiWindowFlags_NoMove;
}
else if (location == -2)
{
// Center window
ImGui::SetNextWindowPos(ImGui::GetMainViewport()->GetCenter(), ImGuiCond_Always, ImVec2(0.5f, 0.5f));
window_flags |= ImGuiWindowFlags_NoMove;
}
ImGui::SetNextWindowBgAlpha(0.35f); // Transparent background
if (ImGui::Begin("Example: Simple overlay", p_open, window_flags))
{
IMGUI_DEMO_MARKER("Examples/Simple Overlay");
ImGui::Text("Simple overlay\n" "in the corner of the screen.\n" "(right-click to change position)");
ImGui::Text("Simple overlay\n" "(right-click to change position)");
ImGui::Separator();
if (ImGui::IsMousePosValid())
ImGui::Text("Mouse Position: (%.1f,%.1f)", io.MousePos.x, io.MousePos.y);
@ -7375,11 +7412,12 @@ static void ShowExampleAppSimpleOverlay(bool* p_open)
ImGui::Text("Mouse Position: <invalid>");
if (ImGui::BeginPopupContextWindow())
{
if (ImGui::MenuItem("Custom", NULL, corner == -1)) corner = -1;
if (ImGui::MenuItem("Top-left", NULL, corner == 0)) corner = 0;
if (ImGui::MenuItem("Top-right", NULL, corner == 1)) corner = 1;
if (ImGui::MenuItem("Bottom-left", NULL, corner == 2)) corner = 2;
if (ImGui::MenuItem("Bottom-right", NULL, corner == 3)) corner = 3;
if (ImGui::MenuItem("Custom", NULL, location == -1)) location = -1;
if (ImGui::MenuItem("Center", NULL, location == -2)) location = -2;
if (ImGui::MenuItem("Top-left", NULL, location == 0)) location = 0;
if (ImGui::MenuItem("Top-right", NULL, location == 1)) location = 1;
if (ImGui::MenuItem("Bottom-left", NULL, location == 2)) location = 2;
if (ImGui::MenuItem("Bottom-right", NULL, location == 3)) location = 3;
if (p_open && ImGui::MenuItem("Close")) *p_open = false;
ImGui::EndPopup();
}