public FontFile.FontSize GetFontSize(float pixelsPreUnit)
{
var actualSize = MathUtils.Round(pixelsPreUnit * size);
if (lastFontSize == null || lastFontSize.size != actualSize)
{
lastFontSize = fontFile.GetFontForSize(actualSize);
}
return(lastFontSize);
}
private float GetCharacterPosition(int id, FontFile.FontSize fontSize, float max)
{
if (id == 0)
{
return(0);
}
if (id == text.Length)
{
return(max);
}
SDL_ttf.TTF_SizeUNICODE(fontSize.handle, text.Substring(0, id), out var w, out _);
return(gui.PixelsToUnits(w));
}
private unsafe int FindCaretIndex(string text, float position, FontFile.FontSize fontSize, float maxWidth)
{
if (string.IsNullOrEmpty(text) || position <= 0f)
{
return(0);
}
var cachedText = gui.textCache.GetCached((fontSize, text, uint.MaxValue));
var maxW = gui.PixelsToUnits(cachedText.texRect.w);
var scale = 1f;
if (maxW > maxWidth)
{
scale = maxWidth / maxW;
maxW = maxWidth;
}
int min = 0, max = text.Length;
var minW = 0f;
if (position >= maxW)
{
return(max);
}
var handle = fontSize.handle;
fixed(char *arr = text)
{
while (max > min + 1)
{
var ratio = (maxW - position) / (maxW - minW);
var mid = MathUtils.Clamp(MathUtils.Round(min * ratio + max * (1f - ratio)), min + 1, max - 1);
var prev = arr[mid];
arr[mid] = '\0';
TTF_SizeUNICODE(handle, arr, out var w, out _);
arr[mid] = prev;
var midW = gui.PixelsToUnits(w) * scale;
if (midW > position)
{
max = mid;
maxW = midW;
}
else
{
min = mid;
minW = midW;
}
}
}
return(maxW - position > position - minW ? min : max);
}
private void GetTextParameters(string textToBuild, Rect textRect, FontFile.FontSize fontSize, RectAlignment alignment, out TextCache cachedText, out float scale, out float textWidth, out Rect realTextRect)
{
realTextRect = textRect;
scale = 1f;
textWidth = 0f;
if (!string.IsNullOrEmpty(textToBuild))
{
cachedText = gui.textCache.GetCached((fontSize, textToBuild, uint.MaxValue));
textWidth = gui.PixelsToUnits(cachedText.texRect.w);
if (textWidth > realTextRect.Width)
{
scale = realTextRect.Width / textWidth;
}
else
{
realTextRect = ImGui.AlignRect(textRect, alignment, textWidth, textRect.Height);
}
}
else
{
realTextRect = ImGui.AlignRect(textRect, alignment, 0f, textRect.Height);
cachedText = null;
}
}
public bool BuildTextInput(string text, out string newText, string placeholder, FontFile.FontSize fontSize, bool delayed, Icon icon, Padding padding, RectAlignment alignment, SchemeColor color)
{
newText = text;
Rect textRect, realTextRect;
using (gui.EnterGroup(padding, RectAllocator.LeftRow))
{
var lineSize = gui.PixelsToUnits(fontSize.lineSize);
if (icon != Icon.None)
{
gui.BuildIcon(icon, lineSize, color + 3);
}
textRect = gui.RemainingRow(0.3f).AllocateRect(0, lineSize, RectAlignment.MiddleFullRow);
}
var boundingRect = gui.lastRect;
var focused = rect == boundingRect;
if (focused && this.text == null)
{
this.text = text ?? "";
SetCaret(0, this.text.Length);
}
switch (gui.action)
{
case ImGuiAction.MouseDown:
if (gui.actionParameter != SDL.SDL_BUTTON_LEFT)
{
break;
}
if (gui.ConsumeMouseDown(boundingRect))
{
SetFocus(boundingRect, text ?? "");
GetTextParameters(this.text, textRect, fontSize, alignment, out _, out _, out _, out realTextRect);
SetCaret(FindCaretIndex(text, gui.mousePosition.X - realTextRect.X, fontSize, textRect.Width));
}
break;
case ImGuiAction.MouseMove:
if (focused && gui.actionParameter == SDL.SDL_BUTTON_LEFT)
{
GetTextParameters(this.text, textRect, fontSize, alignment, out _, out _, out _, out realTextRect);
SetCaret(caret, FindCaretIndex(this.text, gui.mousePosition.X - realTextRect.X, fontSize, textRect.Width));
}
gui.ConsumeMouseOver(boundingRect, RenderingUtils.cursorCaret, false);
break;
case ImGuiAction.Build:
var textColor = color + 2;
string textToBuild;
if (focused)
{
textToBuild = this.text;
}
else if (string.IsNullOrEmpty(text))
{
textToBuild = placeholder;
textColor = color + 3;
}
else
{
textToBuild = text;
}
GetTextParameters(textToBuild, textRect, fontSize, alignment, out var cachedText, out var scale, out var textWidth, out realTextRect);
if (cachedText != null)
{
gui.DrawRenderable(realTextRect, cachedText, textColor);
}
if (focused)
{
if (selectionAnchor != caret)
{
var left = GetCharacterPosition(Math.Min(selectionAnchor, caret), fontSize, textWidth) * scale;
var right = GetCharacterPosition(Math.Max(selectionAnchor, caret), fontSize, textWidth) * scale;
gui.DrawRectangle(new Rect(left + realTextRect.X, realTextRect.Y, right - left, realTextRect.Height), SchemeColor.TextSelection);
}
else
{
if (nextCaretTimer <= Ui.time)
{
nextCaretTimer = Ui.time + 500;
caretVisible = !caretVisible;
}
gui.SetNextRebuild(nextCaretTimer);
if (caretVisible)
{
var caretPosition = GetCharacterPosition(caret, fontSize, textWidth) * scale;
gui.DrawRectangle(new Rect(caretPosition + realTextRect.X - 0.05f, realTextRect.Y, 0.1f, realTextRect.Height), color + 2);
}
}
}
gui.DrawRectangle(boundingRect, color);
break;
}
if (boundingRect == prevRect)
{
var changed = text != prevText;
if (changed)
{
newText = prevText;
}
prevRect = default;
prevText = null;
return(changed);
}
if (focused && !delayed && this.text != text)
{
newText = this.text;
return(true);
}
return(false);
}